diff --git a/tests/common/utils.py b/tests/common/utils.py
index 645dce14647c24d1f07111c1f79ba9a94e27377c..39c3bbd55f68c9091f3020dba4d9cb0b5bf5d842 100644
--- a/tests/common/utils.py
+++ b/tests/common/utils.py
@@ -322,14 +322,23 @@ def space_generator(size=6, chars=string.ascii_uppercase + string.digits):
 
 
 def check_resp(resp, stmt):
+    assert resp is not None, "response is None"
     msg = f"Fail to exec: {stmt}, error: {resp.error_msg()}"
     assert resp.is_succeeded(), msg
 
 
-def create_space(space_desc: SpaceDesc, sess: Session):
-    def exec(stmt):
+def response(sess, stmt):
+    try:
         resp = sess.execute(stmt)
         check_resp(resp, stmt)
+        return resp
+    except Exception as ex:
+        assert not ex, f"Fail to exec: {stmt}, exception: {ex}"
+
+
+def create_space(space_desc: SpaceDesc, sess: Session):
+    def exec(stmt):
+        response(sess, stmt)
 
     exec(space_desc.drop_stmt())
     exec(space_desc.create_stmt())
@@ -339,8 +348,7 @@ def create_space(space_desc: SpaceDesc, sess: Session):
 
 def _load_data_from_file(sess, data_dir, fd):
     for stmt in CSVImporter(fd, data_dir):
-        rs = sess.execute(stmt)
-        check_resp(rs, stmt)
+        response(sess, stmt)
 
 
 def load_csv_data(
@@ -376,8 +384,7 @@ def load_csv_data(
 
         schemas = config['schema']
         stmts = ' '.join(map(lambda x: x.strip(), schemas.splitlines()))
-        rs = sess.execute(stmts)
-        check_resp(rs, stmts)
+        response(sess, stmts)
 
         time.sleep(3)
 
diff --git a/tests/tck/conftest.py b/tests/tck/conftest.py
index f24001c526c52b4dc6f5bc05cd55c54d4280b5d5..d0d533f8a89779fa81af41f5d476d29e3202032f 100644
--- a/tests/tck/conftest.py
+++ b/tests/tck/conftest.py
@@ -18,7 +18,13 @@ from tests.common.dataset_printer import DataSetPrinter
 from tests.common.comparator import DataSetComparator
 from tests.common.configs import DATA_DIR
 from tests.common.types import SpaceDesc
-from tests.common.utils import create_space, load_csv_data, space_generator
+from tests.common.utils import (
+    create_space,
+    load_csv_data,
+    space_generator,
+    check_resp,
+    response,
+)
 from tests.tck.utils.table import dataset, table
 from tests.tck.utils.nbv import murmurhash2
 
@@ -48,8 +54,8 @@ def preload_space(
         graph_spaces["space_desc"] = load_student_data
     else:
         raise ValueError(f"Invalid space name given: {space}")
-    rs = session.execute(f'USE {space};')
-    assert rs.is_succeeded(), f"Fail to use space `{space}': {rs.error_msg()}"
+    stmt = f'USE {space};'
+    response(session, stmt)
 
 
 @given("an empty graph")
@@ -60,9 +66,7 @@ def empty_graph(session, graph_spaces):
 @given(parse("having executed:\n{query}"))
 def having_executed(query, session):
     ngql = " ".join(query.splitlines())
-    resp = session.execute(ngql)
-    assert resp.is_succeeded(), \
-        f"Fail to execute {ngql}, error: {resp.error_msg()}"
+    response(session, ngql)
 
 
 @given(parse("create a space with following options:\n{options}"))
@@ -94,6 +98,7 @@ def import_csv_data(data, graph_spaces, session, pytestconfig):
     )
     assert space_desc is not None
     graph_spaces["space_desc"] = space_desc
+    graph_spaces["drop_space"] = True
 
 
 @when(parse("executing query:\n{query}"))
@@ -116,10 +121,12 @@ def cmp_dataset(graph_spaces,
                 included=False) -> None:
     rs = graph_spaces['result_set']
     ngql = graph_spaces['ngql']
-    space_desc = graph_spaces['space_desc']
-    assert rs.is_succeeded(), f"Response failed: {rs.error_msg()}"
-    vid_fn = murmurhash2 if space_desc.vid_type == 'int' else None
-    ds = dataset(table(result))
+    check_resp(rs, ngql)
+    space_desc = graph_spaces.get('space_desc', None)
+    vid_fn = None
+    if space_desc is not None:
+        vid_fn = murmurhash2 if space_desc.vid_type == 'int' else None
+    ds = dataset(table(result), graph_spaces.get("variables", {}))
     dscmp = DataSetComparator(strict=strict,
                               order=order,
                               included=included,
@@ -147,6 +154,17 @@ def cmp_dataset(graph_spaces,
     assert res, f"Fail to exec: {ngql}\nResponse: {dsp(rds)}\nExpected: {dsp(ds)}\nNotFoundRow: {rowp(ds, i)}"
 
 
+@then(parse("define some list variables:\n{text}"))
+def define_list_var_alias(text, graph_spaces):
+    tbl = table(text)
+    graph_spaces["variables"] = {
+        column: "[" +
+        ",".join(filter(lambda x: x, [row.get(column)
+                                      for row in tbl['rows']])) + "]"
+        for column in tbl['column_names']
+    }
+
+
 @then(parse("the result should be, in order:\n{result}"))
 def result_should_be_in_order(result, graph_spaces):
     cmp_dataset(graph_spaces, result, order=True, strict=True)
@@ -180,8 +198,8 @@ def no_side_effects():
 @then("the execution should be successful")
 def execution_should_be_succ(graph_spaces):
     rs = graph_spaces["result_set"]
-    assert rs is not None, "Please execute a query at first"
-    assert rs.is_succeeded(), f"Response failed: {rs.error_msg()}"
+    stmt = graph_spaces["ngql"]
+    check_resp(rs, stmt)
 
 
 @then(rparse(r"a (?P<err_type>\w+) should be raised at (?P<time>runtime|compile time)(?P<sym>:|.)(?P<msg>.*)"))
@@ -205,6 +223,7 @@ def drop_used_space(session, graph_spaces):
     drop_space = graph_spaces.get("drop_space", False)
     if not drop_space:
         return
-    space_desc = graph_spaces["space_desc"]
-    resp = session.execute(space_desc.drop_stmt())
-    assert resp.is_succeeded(), f"Fail to drop space {space_desc.name}"
+    space_desc = graph_spaces.get("space_desc", None)
+    if space_desc is not None:
+        stmt = space_desc.drop_stmt()
+        response(session, stmt)
diff --git a/tests/tck/features/subgraph/subgraph.IntVid.feature b/tests/tck/features/subgraph/subgraph.IntVid.feature
index 92b993cb1a2fd8f690662c36dbade79194582cd2..f670b847d14a3586b9ac68a9c36a648e8c68d15c 100644
--- a/tests/tck/features/subgraph/subgraph.IntVid.feature
+++ b/tests/tck/features/subgraph/subgraph.IntVid.feature
@@ -101,344 +101,344 @@ Feature: Integer Vid subgraph
       """
       GET SUBGRAPH FROM hash('Tim Duncan')
       """
-    Then example
-      | vertex1        | edge1                                           | vertex2               | edge2                                            |
-      | ("Tim Duncan") | [:teammate "Manu Ginobili"->"Tim Duncan"@0]     | ("Danny Green")       | [:teammate "Tony Parker"->"Manu Ginobili"@0]     |
-      |                | [:teammate "Tony Parker"->"Tim Duncan"@0]       | ("Manu Ginobili")     | [:like "Dejounte Murray"->"Manu Ginobili"@0]     |
-      |                | [:like "Aron Baynes"->"Tim Duncan"@0]           | ("Aron Baynes")       | [:like "Tiago Splitter"->"Manu Ginobili"@0]      |
-      |                | [:like "Boris Diaw"->"Tim Duncan"@0]            | ("Boris Diaw")        | [:like "Tony Parker"->"Manu Ginobili"@0]         |
-      |                | [:like "Danny Green"->"Tim Duncan"@0]           | ("Shaquile O\'Neal")  | [:serve "Manu Ginobili"->"Spurs"@0]              |
-      |                | [:like "Dejounte Murray"->"Tim Duncan"@0]       | ("Tony Parker")       | [:teammate "Manu Ginobili"->"Tony Parker"@0]     |
-      |                | [:like "LaMarcus Aldridge"->"Tim Duncan"@0]     | ("Spurs")             | [:serve "Aron Baynes"->"Spurs"@0]                |
-      |                | [:like "Manu Ginobili"->"Tim Duncan"@0]         | ("Dejounte Murray")   | [:like "Boris Diaw"->"Tony Parker"@0]            |
-      |                | [:like "Marco Belinelli"->"Tim Duncan"@0]       | ("LaMarcus Aldridge") | [:serve "Boris Diaw"->"Spurs"@0]                 |
-      |                | [:like "Shaquile O\'Neal"->"Tim Duncan"@0]      | ("Marco Belinelli")   | [:like "Dejounte Murray"->"Tony Parker"@0]       |
-      |                | [:like "Tiago Splitter"->"Tim Duncan"@0]        | ("Tiago Splitter")    | [:like "LaMarcus Aldridge"->"Tony Parker"@0]     |
-      |                | [:like "Tony Parker"->"Tim Duncan"@0]           |                       | [:like "Marco Belinelli"->"Tony Parker"@0]       |
-      |                | [:like "Tim Duncan"->"Manu Ginobili"@0]         |                       | [:like "Tony Parker"->"LaMarcus Aldridge"@0]     |
-      |                | [:like "Tim Duncan"->"Tony Parker"@0]           |                       | [:serve "Tony Parker"->"Spurs"@0]                |
-      |                | [:serve "Tim Duncan"->"Spurs"@0]                |                       | [:teammate "Tony Parker"->"LaMarcus Aldridge"@0] |
-      |                | [:teammate "Tim Duncan"->"Danny Green"@0]       |                       | [:serve "Dejounte Murray"->"Spurs"@0]            |
-      |                | [:teammate "Tim Duncan"->"LaMarcus Aldridge"@0] |                       | [:serve "LaMarcus Aldridge"->"Spurs"@0]          |
-      |                | [:teammate "Tim Duncan"->"Manu Ginobili"@0]     |                       | [:serve "Marco Belinelli"->"Spurs"@0]            |
-      |                | [:teammate "Tim Duncan"->"Tony Parker"@0]       |                       | [:serve "Tiago Splitter"->"Spurs"@0]             |
-      |                |                                                 |                       | [:serve "Marco Belinelli"->"Spurs"@1]            |
-      |                |                                                 |                       | [:like "Dejounte Murray"->"Marco Belinelli"@0]   |
-      |                |                                                 |                       | [:like "Dejounte Murray"->"Danny Green"@0]       |
-      |                |                                                 |                       | [:like "Marco Belinelli"->"Danny Green"@0]       |
-      |                |                                                 |                       | [:like "Danny Green"->"Marco Belinelli"@0]       |
-      |                |                                                 |                       | [:serve "Danny Green"->"Spurs"@0]                |
+    Then define some list variables:
+      | edge1                                           | vertex2               | edge2                                            |
+      | [:teammate "Manu Ginobili"->"Tim Duncan"@0]     | ("Danny Green")       | [:teammate "Tony Parker"->"Manu Ginobili"@0]     |
+      | [:teammate "Tony Parker"->"Tim Duncan"@0]       | ("Manu Ginobili")     | [:like "Dejounte Murray"->"Manu Ginobili"@0]     |
+      | [:like "Aron Baynes"->"Tim Duncan"@0]           | ("Aron Baynes")       | [:like "Tiago Splitter"->"Manu Ginobili"@0]      |
+      | [:like "Boris Diaw"->"Tim Duncan"@0]            | ("Boris Diaw")        | [:like "Tony Parker"->"Manu Ginobili"@0]         |
+      | [:like "Danny Green"->"Tim Duncan"@0]           | ("Shaquile O\'Neal")  | [:serve "Manu Ginobili"->"Spurs"@0]              |
+      | [:like "Dejounte Murray"->"Tim Duncan"@0]       | ("Tony Parker")       | [:teammate "Manu Ginobili"->"Tony Parker"@0]     |
+      | [:like "LaMarcus Aldridge"->"Tim Duncan"@0]     | ("Spurs")             | [:serve "Aron Baynes"->"Spurs"@0]                |
+      | [:like "Manu Ginobili"->"Tim Duncan"@0]         | ("Dejounte Murray")   | [:like "Boris Diaw"->"Tony Parker"@0]            |
+      | [:like "Marco Belinelli"->"Tim Duncan"@0]       | ("LaMarcus Aldridge") | [:serve "Boris Diaw"->"Spurs"@0]                 |
+      | [:like "Shaquile O\'Neal"->"Tim Duncan"@0]      | ("Marco Belinelli")   | [:like "Dejounte Murray"->"Tony Parker"@0]       |
+      | [:like "Tiago Splitter"->"Tim Duncan"@0]        | ("Tiago Splitter")    | [:like "LaMarcus Aldridge"->"Tony Parker"@0]     |
+      | [:like "Tony Parker"->"Tim Duncan"@0]           |                       | [:like "Marco Belinelli"->"Tony Parker"@0]       |
+      | [:like "Tim Duncan"->"Manu Ginobili"@0]         |                       | [:like "Tony Parker"->"LaMarcus Aldridge"@0]     |
+      | [:like "Tim Duncan"->"Tony Parker"@0]           |                       | [:serve "Tony Parker"->"Spurs"@0]                |
+      | [:serve "Tim Duncan"->"Spurs"@0]                |                       | [:teammate "Tony Parker"->"LaMarcus Aldridge"@0] |
+      | [:teammate "Tim Duncan"->"Danny Green"@0]       |                       | [:serve "Dejounte Murray"->"Spurs"@0]            |
+      | [:teammate "Tim Duncan"->"LaMarcus Aldridge"@0] |                       | [:serve "LaMarcus Aldridge"->"Spurs"@0]          |
+      | [:teammate "Tim Duncan"->"Manu Ginobili"@0]     |                       | [:serve "Marco Belinelli"->"Spurs"@0]            |
+      | [:teammate "Tim Duncan"->"Tony Parker"@0]       |                       | [:serve "Tiago Splitter"->"Spurs"@0]             |
+      |                                                 |                       | [:serve "Marco Belinelli"->"Spurs"@1]            |
+      |                                                 |                       | [:like "Dejounte Murray"->"Marco Belinelli"@0]   |
+      |                                                 |                       | [:like "Dejounte Murray"->"Danny Green"@0]       |
+      |                                                 |                       | [:like "Marco Belinelli"->"Danny Green"@0]       |
+      |                                                 |                       | [:like "Danny Green"->"Marco Belinelli"@0]       |
+      |                                                 |                       | [:serve "Danny Green"->"Spurs"@0]                |
     Then the result should be, in any order, with relax comparison:
-      | _vertices | _edges |
-      | vertex1   | edge1  |
-      | vertex2   | edge2  |
+      | _vertices        | _edges    |
+      | [("Tim Duncan")] | <[edge1]> |
+      | <[vertex2]>      | <[edge2]> |
 
   Scenario: Integer Vid two steps
     When executing query:
       """
       GET SUBGRAPH 2 STEPS FROM hash('Tim Duncan')
       """
-    Then example
-      | vertex1        | edge1                                           | vertex2               | edge2                                            | vertex3               | edge3                                         |
-      | ("Tim Duncan") | [:teammate "Manu Ginobili"->"Tim Duncan"@0]     | ("Danny Green")       | [:like "Dejounte Murray"->"Danny Green"@0]       | ("Cavaliers")         | [:serve "LeBron James"->"Cavaliers"@0]        |
-      |                | [:teammate "Tony Parker"->"Tim Duncan"@0]       | ("Manu Ginobili")     | [:like "Marco Belinelli"->"Danny Green"@0]       | ("Pistons")           | [:serve "LeBron James"->"Cavaliers"@1]        |
-      |                | [:like "Aron Baynes"->"Tim Duncan"@0]           | ("Aron Baynes")       | [:like "Danny Green"->"LeBron James"@0]          | ("Damian Lillard")    | [:serve "Damian Lillard"->"Trail Blazers"@0]  |
-      |                | [:like "Boris Diaw"->"Tim Duncan"@0]            | ("Boris Diaw")        | [:like "Danny Green"->"Marco Belinelli"@0]       | ("Kings")             | [:serve "Rudy Gay"->"Kings"@0]                |
-      |                | [:like "Danny Green"->"Tim Duncan"@0]           | ("Shaquile O\'Neal")  | [:serve "Danny Green"->"Cavaliers"@0]            | ("Raptors")           | [:serve "Cory Joseph"->"Raptors"@0]           |
-      |                | [:like "Dejounte Murray"->"Tim Duncan"@0]       | ("Tony Parker")       | [:serve "Danny Green"->"Raptors"@0]              | ("Jazz")              | [:serve "Rudy Gay"->"Raptors"@0]              |
-      |                | [:like "LaMarcus Aldridge"->"Tim Duncan"@0]     | ("Spurs")             | [:serve "Danny Green"->"Spurs"@0]                | ("LeBron James")      | [:serve "Tracy McGrady"->"Raptors"@0]         |
-      |                | [:like "Manu Ginobili"->"Tim Duncan"@0]         | ("Dejounte Murray")   | [:teammate "Tony Parker"->"Manu Ginobili"@0]     | ("Paul Gasol")        | [:like "Chris Paul"->"LeBron James"@0]        |
-      |                | [:like "Marco Belinelli"->"Tim Duncan"@0]       | ("LaMarcus Aldridge") | [:like "Dejounte Murray"->"Manu Ginobili"@0]     | ("Kyle Anderson")     | [:serve "LeBron James"->"Heat"@0]             |
-      |                | [:like "Shaquile O\'Neal"->"Tim Duncan"@0]      | ("Marco Belinelli")   | [:like "Tiago Splitter"->"Manu Ginobili"@0]      | ("Rudy Gay")          | [:serve "LeBron James"->"Lakers"@0]           |
-      |                | [:like "Tiago Splitter"->"Tim Duncan"@0]        | ("Tiago Splitter")    | [:like "Tony Parker"->"Manu Ginobili"@0]         | ("Kevin Durant")      | [:serve "Paul Gasol"->"Bulls"@0]              |
-      |                | [:like "Tony Parker"->"Tim Duncan"@0]           |                       | [:serve "Manu Ginobili"->"Spurs"@0]              | ("Yao Ming")          | [:serve "Paul Gasol"->"Lakers"@0]             |
-      |                | [:like "Tim Duncan"->"Manu Ginobili"@0]         |                       | [:teammate "Manu Ginobili"->"Tony Parker"@0]     | ("James Harden")      | [:like "Tracy McGrady"->"Rudy Gay"@0]         |
-      |                | [:like "Tim Duncan"->"Tony Parker"@0]           |                       | [:serve "Aron Baynes"->"Celtics"@0]              | ("Hornets")           | [:serve "Kevin Durant"->"Warriors"@0]         |
-      |                | [:serve "Tim Duncan"->"Spurs"@0]                |                       | [:serve "Aron Baynes"->"Pistons"@0]              | ("David West")        | [:like "Yao Ming"->"Tracy McGrady"@0]         |
-      |                | [:teammate "Tim Duncan"->"Danny Green"@0]       |                       | [:serve "Aron Baynes"->"Spurs"@0]                | ("Chris Paul")        | [:like "Russell Westbrook"->"James Harden"@0] |
-      |                | [:teammate "Tim Duncan"->"LaMarcus Aldridge"@0] |                       | [:like "Boris Diaw"->"Tony Parker"@0]            | ("Celtics")           | [:like "James Harden"->"Russell Westbrook"@0] |
-      |                | [:teammate "Tim Duncan"->"Manu Ginobili"@0]     |                       | [:serve "Boris Diaw"->"Hawks"@0]                 | ("Jonathon Simmons")  | [:serve "Chris Paul"->"Hornets"@0]            |
-      |                | [:teammate "Tim Duncan"->"Tony Parker"@0]       |                       | [:serve "Boris Diaw"->"Hornets"@0]               | ("Hawks")             | [:serve "David West"->"Hornets"@0]            |
-      |                |                                                 |                       | [:serve "Boris Diaw"->"Jazz"@0]                  | ("Heat")              | [:serve "David West"->"Warriors"@0]           |
-      |                |                                                 |                       | [:serve "Boris Diaw"->"Spurs"@0]                 | ("Lakers")            | [:serve "Jonathon Simmons"->"76ers"@0]        |
-      |                |                                                 |                       | [:serve "Boris Diaw"->"Suns"@0]                  | ("Suns")              | [:serve "Jonathon Simmons"->"Magic"@0]        |
-      |                |                                                 |                       | [:like "Yao Ming"->"Shaquile O\'Neal"@0]         | ("Magic")             | [:serve "JaVale McGee"->"Lakers"@0]           |
-      |                |                                                 |                       | [:like "Shaquile O\'Neal"->"JaVale McGee"@0]     | ("Trail Blazers")     | [:serve "Tracy McGrady"->"Magic"@0]           |
-      |                |                                                 |                       | [:serve "Shaquile O\'Neal"->"Cavaliers"@0]       | ("76ers")             | [:serve "JaVale McGee"->"Warriors"@0]         |
-      |                |                                                 |                       | [:serve "Shaquile O\'Neal"->"Celtics"@0]         | ("JaVale McGee")      |                                               |
-      |                |                                                 |                       | [:serve "Shaquile O\'Neal"->"Heat"@0]            | ("Cory Joseph")       |                                               |
-      |                |                                                 |                       | [:serve "Shaquile O\'Neal"->"Lakers"@0]          | ("Tracy McGrady")     |                                               |
-      |                |                                                 |                       | [:serve "Shaquile O\'Neal"->"Magic"@0]           | ("Russell Westbrook") |                                               |
-      |                |                                                 |                       | [:serve "Shaquile O\'Neal"->"Suns"@0]            | ("Bulls")             |                                               |
-      |                |                                                 |                       | [:like "Dejounte Murray"->"Tony Parker"@0]       | ("Warriors")          |                                               |
-      |                |                                                 |                       | [:like "LaMarcus Aldridge"->"Tony Parker"@0]     |                       |                                               |
-      |                |                                                 |                       | [:like "Marco Belinelli"->"Tony Parker"@0]       |                       |                                               |
-      |                |                                                 |                       | [:like "Tony Parker"->"LaMarcus Aldridge"@0]     |                       |                                               |
-      |                |                                                 |                       | [:serve "Tony Parker"->"Hornets"@0]              |                       |                                               |
-      |                |                                                 |                       | [:serve "Tony Parker"->"Spurs"@0]                |                       |                                               |
-      |                |                                                 |                       | [:teammate "Tony Parker"->"Kyle Anderson"@0]     |                       |                                               |
-      |                |                                                 |                       | [:teammate "Tony Parker"->"LaMarcus Aldridge"@0] |                       |                                               |
-      |                |                                                 |                       | [:serve "Cory Joseph"->"Spurs"@0]                |                       |                                               |
-      |                |                                                 |                       | [:serve "David West"->"Spurs"@0]                 |                       |                                               |
-      |                |                                                 |                       | [:serve "Dejounte Murray"->"Spurs"@0]            |                       |                                               |
-      |                |                                                 |                       | [:serve "Jonathon Simmons"->"Spurs"@0]           |                       |                                               |
-      |                |                                                 |                       | [:serve "Kyle Anderson"->"Spurs"@0]              |                       |                                               |
-      |                |                                                 |                       | [:serve "LaMarcus Aldridge"->"Spurs"@0]          |                       |                                               |
-      |                |                                                 |                       | [:serve "Marco Belinelli"->"Spurs"@0]            |                       |                                               |
-      |                |                                                 |                       | [:serve "Paul Gasol"->"Spurs"@0]                 |                       |                                               |
-      |                |                                                 |                       | [:serve "Rudy Gay"->"Spurs"@0]                   |                       |                                               |
-      |                |                                                 |                       | [:serve "Tiago Splitter"->"Spurs"@0]             |                       |                                               |
-      |                |                                                 |                       | [:serve "Tracy McGrady"->"Spurs"@0]              |                       |                                               |
-      |                |                                                 |                       | [:serve "Marco Belinelli"->"Spurs"@1]            |                       |                                               |
-      |                |                                                 |                       | [:like "Dejounte Murray"->"Chris Paul"@0]        |                       |                                               |
-      |                |                                                 |                       | [:like "Dejounte Murray"->"James Harden"@0]      |                       |                                               |
-      |                |                                                 |                       | [:like "Dejounte Murray"->"Kevin Durant"@0]      |                       |                                               |
-      |                |                                                 |                       | [:like "Dejounte Murray"->"Kyle Anderson"@0]     |                       |                                               |
-      |                |                                                 |                       | [:like "Dejounte Murray"->"LeBron James"@0]      |                       |                                               |
-      |                |                                                 |                       | [:like "Dejounte Murray"->"Marco Belinelli"@0]   |                       |                                               |
-      |                |                                                 |                       | [:like "Dejounte Murray"->"Russell Westbrook"@0] |                       |                                               |
-      |                |                                                 |                       | [:like "Damian Lillard"->"LaMarcus Aldridge"@0]  |                       |                                               |
-      |                |                                                 |                       | [:like "Rudy Gay"->"LaMarcus Aldridge"@0]        |                       |                                               |
-      |                |                                                 |                       | [:serve "LaMarcus Aldridge"->"Trail Blazers"@0]  |                       |                                               |
-      |                |                                                 |                       | [:serve "Marco Belinelli"->"76ers"@0]            |                       |                                               |
-      |                |                                                 |                       | [:serve "Marco Belinelli"->"Bulls"@0]            |                       |                                               |
-      |                |                                                 |                       | [:serve "Marco Belinelli"->"Hawks"@0]            |                       |                                               |
-      |                |                                                 |                       | [:serve "Marco Belinelli"->"Hornets"@0]          |                       |                                               |
-      |                |                                                 |                       | [:serve "Marco Belinelli"->"Kings"@0]            |                       |                                               |
-      |                |                                                 |                       | [:serve "Marco Belinelli"->"Raptors"@0]          |                       |                                               |
-      |                |                                                 |                       | [:serve "Marco Belinelli"->"Warriors"@0]         |                       |                                               |
-      |                |                                                 |                       | [:serve "Marco Belinelli"->"Hornets"@1]          |                       |                                               |
-      |                |                                                 |                       | [:serve "Tiago Splitter"->"76ers"@0]             |                       |                                               |
-      |                |                                                 |                       | [:serve "Tiago Splitter"->"Hawks"@0]             |                       |                                               |
+    Then define some list variables:
+      | edge1                                           | vertex2               | edge2                                            | vertex3               | edge3                                         |
+      | [:teammate "Manu Ginobili"->"Tim Duncan"@0]     | ("Danny Green")       | [:like "Dejounte Murray"->"Danny Green"@0]       | ("Cavaliers")         | [:serve "LeBron James"->"Cavaliers"@0]        |
+      | [:teammate "Tony Parker"->"Tim Duncan"@0]       | ("Manu Ginobili")     | [:like "Marco Belinelli"->"Danny Green"@0]       | ("Pistons")           | [:serve "LeBron James"->"Cavaliers"@1]        |
+      | [:like "Aron Baynes"->"Tim Duncan"@0]           | ("Aron Baynes")       | [:like "Danny Green"->"LeBron James"@0]          | ("Damian Lillard")    | [:serve "Damian Lillard"->"Trail Blazers"@0]  |
+      | [:like "Boris Diaw"->"Tim Duncan"@0]            | ("Boris Diaw")        | [:like "Danny Green"->"Marco Belinelli"@0]       | ("Kings")             | [:serve "Rudy Gay"->"Kings"@0]                |
+      | [:like "Danny Green"->"Tim Duncan"@0]           | ("Shaquile O\'Neal")  | [:serve "Danny Green"->"Cavaliers"@0]            | ("Raptors")           | [:serve "Cory Joseph"->"Raptors"@0]           |
+      | [:like "Dejounte Murray"->"Tim Duncan"@0]       | ("Tony Parker")       | [:serve "Danny Green"->"Raptors"@0]              | ("Jazz")              | [:serve "Rudy Gay"->"Raptors"@0]              |
+      | [:like "LaMarcus Aldridge"->"Tim Duncan"@0]     | ("Spurs")             | [:serve "Danny Green"->"Spurs"@0]                | ("LeBron James")      | [:serve "Tracy McGrady"->"Raptors"@0]         |
+      | [:like "Manu Ginobili"->"Tim Duncan"@0]         | ("Dejounte Murray")   | [:teammate "Tony Parker"->"Manu Ginobili"@0]     | ("Paul Gasol")        | [:like "Chris Paul"->"LeBron James"@0]        |
+      | [:like "Marco Belinelli"->"Tim Duncan"@0]       | ("LaMarcus Aldridge") | [:like "Dejounte Murray"->"Manu Ginobili"@0]     | ("Kyle Anderson")     | [:serve "LeBron James"->"Heat"@0]             |
+      | [:like "Shaquile O\'Neal"->"Tim Duncan"@0]      | ("Marco Belinelli")   | [:like "Tiago Splitter"->"Manu Ginobili"@0]      | ("Rudy Gay")          | [:serve "LeBron James"->"Lakers"@0]           |
+      | [:like "Tiago Splitter"->"Tim Duncan"@0]        | ("Tiago Splitter")    | [:like "Tony Parker"->"Manu Ginobili"@0]         | ("Kevin Durant")      | [:serve "Paul Gasol"->"Bulls"@0]              |
+      | [:like "Tony Parker"->"Tim Duncan"@0]           |                       | [:serve "Manu Ginobili"->"Spurs"@0]              | ("Yao Ming")          | [:serve "Paul Gasol"->"Lakers"@0]             |
+      | [:like "Tim Duncan"->"Manu Ginobili"@0]         |                       | [:teammate "Manu Ginobili"->"Tony Parker"@0]     | ("James Harden")      | [:like "Tracy McGrady"->"Rudy Gay"@0]         |
+      | [:like "Tim Duncan"->"Tony Parker"@0]           |                       | [:serve "Aron Baynes"->"Celtics"@0]              | ("Hornets")           | [:serve "Kevin Durant"->"Warriors"@0]         |
+      | [:serve "Tim Duncan"->"Spurs"@0]                |                       | [:serve "Aron Baynes"->"Pistons"@0]              | ("David West")        | [:like "Yao Ming"->"Tracy McGrady"@0]         |
+      | [:teammate "Tim Duncan"->"Danny Green"@0]       |                       | [:serve "Aron Baynes"->"Spurs"@0]                | ("Chris Paul")        | [:like "Russell Westbrook"->"James Harden"@0] |
+      | [:teammate "Tim Duncan"->"LaMarcus Aldridge"@0] |                       | [:like "Boris Diaw"->"Tony Parker"@0]            | ("Celtics")           | [:like "James Harden"->"Russell Westbrook"@0] |
+      | [:teammate "Tim Duncan"->"Manu Ginobili"@0]     |                       | [:serve "Boris Diaw"->"Hawks"@0]                 | ("Jonathon Simmons")  | [:serve "Chris Paul"->"Hornets"@0]            |
+      | [:teammate "Tim Duncan"->"Tony Parker"@0]       |                       | [:serve "Boris Diaw"->"Hornets"@0]               | ("Hawks")             | [:serve "David West"->"Hornets"@0]            |
+      |                                                 |                       | [:serve "Boris Diaw"->"Jazz"@0]                  | ("Heat")              | [:serve "David West"->"Warriors"@0]           |
+      |                                                 |                       | [:serve "Boris Diaw"->"Spurs"@0]                 | ("Lakers")            | [:serve "Jonathon Simmons"->"76ers"@0]        |
+      |                                                 |                       | [:serve "Boris Diaw"->"Suns"@0]                  | ("Suns")              | [:serve "Jonathon Simmons"->"Magic"@0]        |
+      |                                                 |                       | [:like "Yao Ming"->"Shaquile O\'Neal"@0]         | ("Magic")             | [:serve "JaVale McGee"->"Lakers"@0]           |
+      |                                                 |                       | [:like "Shaquile O\'Neal"->"JaVale McGee"@0]     | ("Trail Blazers")     | [:serve "Tracy McGrady"->"Magic"@0]           |
+      |                                                 |                       | [:serve "Shaquile O\'Neal"->"Cavaliers"@0]       | ("76ers")             | [:serve "JaVale McGee"->"Warriors"@0]         |
+      |                                                 |                       | [:serve "Shaquile O\'Neal"->"Celtics"@0]         | ("JaVale McGee")      |                                               |
+      |                                                 |                       | [:serve "Shaquile O\'Neal"->"Heat"@0]            | ("Cory Joseph")       |                                               |
+      |                                                 |                       | [:serve "Shaquile O\'Neal"->"Lakers"@0]          | ("Tracy McGrady")     |                                               |
+      |                                                 |                       | [:serve "Shaquile O\'Neal"->"Magic"@0]           | ("Russell Westbrook") |                                               |
+      |                                                 |                       | [:serve "Shaquile O\'Neal"->"Suns"@0]            | ("Bulls")             |                                               |
+      |                                                 |                       | [:like "Dejounte Murray"->"Tony Parker"@0]       | ("Warriors")          |                                               |
+      |                                                 |                       | [:like "LaMarcus Aldridge"->"Tony Parker"@0]     |                       |                                               |
+      |                                                 |                       | [:like "Marco Belinelli"->"Tony Parker"@0]       |                       |                                               |
+      |                                                 |                       | [:like "Tony Parker"->"LaMarcus Aldridge"@0]     |                       |                                               |
+      |                                                 |                       | [:serve "Tony Parker"->"Hornets"@0]              |                       |                                               |
+      |                                                 |                       | [:serve "Tony Parker"->"Spurs"@0]                |                       |                                               |
+      |                                                 |                       | [:teammate "Tony Parker"->"Kyle Anderson"@0]     |                       |                                               |
+      |                                                 |                       | [:teammate "Tony Parker"->"LaMarcus Aldridge"@0] |                       |                                               |
+      |                                                 |                       | [:serve "Cory Joseph"->"Spurs"@0]                |                       |                                               |
+      |                                                 |                       | [:serve "David West"->"Spurs"@0]                 |                       |                                               |
+      |                                                 |                       | [:serve "Dejounte Murray"->"Spurs"@0]            |                       |                                               |
+      |                                                 |                       | [:serve "Jonathon Simmons"->"Spurs"@0]           |                       |                                               |
+      |                                                 |                       | [:serve "Kyle Anderson"->"Spurs"@0]              |                       |                                               |
+      |                                                 |                       | [:serve "LaMarcus Aldridge"->"Spurs"@0]          |                       |                                               |
+      |                                                 |                       | [:serve "Marco Belinelli"->"Spurs"@0]            |                       |                                               |
+      |                                                 |                       | [:serve "Paul Gasol"->"Spurs"@0]                 |                       |                                               |
+      |                                                 |                       | [:serve "Rudy Gay"->"Spurs"@0]                   |                       |                                               |
+      |                                                 |                       | [:serve "Tiago Splitter"->"Spurs"@0]             |                       |                                               |
+      |                                                 |                       | [:serve "Tracy McGrady"->"Spurs"@0]              |                       |                                               |
+      |                                                 |                       | [:serve "Marco Belinelli"->"Spurs"@1]            |                       |                                               |
+      |                                                 |                       | [:like "Dejounte Murray"->"Chris Paul"@0]        |                       |                                               |
+      |                                                 |                       | [:like "Dejounte Murray"->"James Harden"@0]      |                       |                                               |
+      |                                                 |                       | [:like "Dejounte Murray"->"Kevin Durant"@0]      |                       |                                               |
+      |                                                 |                       | [:like "Dejounte Murray"->"Kyle Anderson"@0]     |                       |                                               |
+      |                                                 |                       | [:like "Dejounte Murray"->"LeBron James"@0]      |                       |                                               |
+      |                                                 |                       | [:like "Dejounte Murray"->"Marco Belinelli"@0]   |                       |                                               |
+      |                                                 |                       | [:like "Dejounte Murray"->"Russell Westbrook"@0] |                       |                                               |
+      |                                                 |                       | [:like "Damian Lillard"->"LaMarcus Aldridge"@0]  |                       |                                               |
+      |                                                 |                       | [:like "Rudy Gay"->"LaMarcus Aldridge"@0]        |                       |                                               |
+      |                                                 |                       | [:serve "LaMarcus Aldridge"->"Trail Blazers"@0]  |                       |                                               |
+      |                                                 |                       | [:serve "Marco Belinelli"->"76ers"@0]            |                       |                                               |
+      |                                                 |                       | [:serve "Marco Belinelli"->"Bulls"@0]            |                       |                                               |
+      |                                                 |                       | [:serve "Marco Belinelli"->"Hawks"@0]            |                       |                                               |
+      |                                                 |                       | [:serve "Marco Belinelli"->"Hornets"@0]          |                       |                                               |
+      |                                                 |                       | [:serve "Marco Belinelli"->"Kings"@0]            |                       |                                               |
+      |                                                 |                       | [:serve "Marco Belinelli"->"Raptors"@0]          |                       |                                               |
+      |                                                 |                       | [:serve "Marco Belinelli"->"Warriors"@0]         |                       |                                               |
+      |                                                 |                       | [:serve "Marco Belinelli"->"Hornets"@1]          |                       |                                               |
+      |                                                 |                       | [:serve "Tiago Splitter"->"76ers"@0]             |                       |                                               |
+      |                                                 |                       | [:serve "Tiago Splitter"->"Hawks"@0]             |                       |                                               |
     Then the result should be, in any order, with relax comparison:
-      | _vertices | _edges |
-      | vertex1   | edge1  |
-      | vertex2   | edge2  |
-      | vertex3   | edge3  |
+      | _vertices        | _edges    |
+      | [("Tim Duncan")] | <[edge1]> |
+      | <[vertex2]>      | <[edge2]> |
+      | <[vertex3]>      | <[edge3]> |
 
   Scenario: Integer Vid in edge
     When executing query:
       """
       GET SUBGRAPH 2 STEPS FROM hash('Tim Duncan') IN like, serve
       """
-    Then example
-      | vertex1        | edge1                                       | vertex2               | edge2                                           | vertex3             | edge3                                            |
-      | ("Tim Duncan") | [:like "Aron Baynes"->"Tim Duncan"@0]       | ("Manu Ginobili")     | [:like "Dejounte Murray"->"Manu Ginobili"@0]    | ("Damian Lillard")  | [:teammate "Manu Ginobili"->"Tim Duncan"@0]      |
-      |                | [:like "Boris Diaw"->"Tim Duncan"@0]        | ("Shaquile O\'Neal")  | [:like "Tiago Splitter"->"Manu Ginobili"@0]     | ("Rudy Gay")        | [:teammate "Tony Parker"->"Tim Duncan"@0]        |
-      |                | [:like "Danny Green"->"Tim Duncan"@0]       | ("LaMarcus Aldridge") | [:like "Tim Duncan"->"Manu Ginobili"@0]         | ("Dejounte Murray") | [:teammate "Tim Duncan"->"Danny Green"@0]        |
-      |                | [:like "Dejounte Murray"->"Tim Duncan"@0]   | ("Marco Belinelli")   | [:like "Tony Parker"->"Manu Ginobili"@0]        | ("Yao Ming")        | [:teammate "Tim Duncan"->"LaMarcus Aldridge"@0]  |
-      |                | [:like "LaMarcus Aldridge"->"Tim Duncan"@0] | ("Danny Green")       | [:like "Yao Ming"->"Shaquile O\'Neal"@0]        | ("Tiago Splitter")  | [:teammate "Tim Duncan"->"Manu Ginobili"@0]      |
-      |                | [:like "Manu Ginobili"->"Tim Duncan"@0]     | ("Tony Parker")       | [:like "Damian Lillard"->"LaMarcus Aldridge"@0] | ("Boris Diaw")      | [:teammate "Tim Duncan"->"Tony Parker"@0]        |
-      |                | [:like "Marco Belinelli"->"Tim Duncan"@0]   |                       | [:like "Rudy Gay"->"LaMarcus Aldridge"@0]       |                     | [:teammate "Manu Ginobili"->"Tony Parker"@0]     |
-      |                | [:like "Shaquile O\'Neal"->"Tim Duncan"@0]  |                       | [:like "Tony Parker"->"LaMarcus Aldridge"@0]    |                     | [:teammate "Tony Parker"->"LaMarcus Aldridge"@0] |
-      |                | [:like "Tiago Splitter"->"Tim Duncan"@0]    |                       | [:like "Danny Green"->"Marco Belinelli"@0]      |                     | [:teammate "Tony Parker"->"Manu Ginobili"@0]     |
-      |                | [:like "Tony Parker"->"Tim Duncan"@0]       |                       | [:like "Dejounte Murray"->"Marco Belinelli"@0]  |                     |                                                  |
-      |                |                                             |                       | [:like "Dejounte Murray"->"Danny Green"@0]      |                     |                                                  |
-      |                |                                             |                       | [:like "Marco Belinelli"->"Danny Green"@0]      |                     |                                                  |
-      |                |                                             |                       | [:like "Boris Diaw"->"Tony Parker"@0]           |                     |                                                  |
-      |                |                                             |                       | [:like "Dejounte Murray"->"Tony Parker"@0]      |                     |                                                  |
-      |                |                                             |                       | [:like "LaMarcus Aldridge"->"Tony Parker"@0]    |                     |                                                  |
-      |                |                                             |                       | [:like "Marco Belinelli"->"Tony Parker"@0]      |                     |                                                  |
-      |                |                                             |                       | [:like "Tim Duncan"->"Tony Parker"@0]           |                     |                                                  |
+    Then define some list variables:
+      | edge1                                       | vertex2               | edge2                                           | vertex3             | edge3                                            |
+      | [:like "Aron Baynes"->"Tim Duncan"@0]       | ("Manu Ginobili")     | [:like "Dejounte Murray"->"Manu Ginobili"@0]    | ("Damian Lillard")  | [:teammate "Manu Ginobili"->"Tim Duncan"@0]      |
+      | [:like "Boris Diaw"->"Tim Duncan"@0]        | ("Shaquile O\'Neal")  | [:like "Tiago Splitter"->"Manu Ginobili"@0]     | ("Rudy Gay")        | [:teammate "Tony Parker"->"Tim Duncan"@0]        |
+      | [:like "Danny Green"->"Tim Duncan"@0]       | ("LaMarcus Aldridge") | [:like "Tim Duncan"->"Manu Ginobili"@0]         | ("Dejounte Murray") | [:teammate "Tim Duncan"->"Danny Green"@0]        |
+      | [:like "Dejounte Murray"->"Tim Duncan"@0]   | ("Marco Belinelli")   | [:like "Tony Parker"->"Manu Ginobili"@0]        | ("Yao Ming")        | [:teammate "Tim Duncan"->"LaMarcus Aldridge"@0]  |
+      | [:like "LaMarcus Aldridge"->"Tim Duncan"@0] | ("Danny Green")       | [:like "Yao Ming"->"Shaquile O\'Neal"@0]        | ("Tiago Splitter")  | [:teammate "Tim Duncan"->"Manu Ginobili"@0]      |
+      | [:like "Manu Ginobili"->"Tim Duncan"@0]     | ("Tony Parker")       | [:like "Damian Lillard"->"LaMarcus Aldridge"@0] | ("Boris Diaw")      | [:teammate "Tim Duncan"->"Tony Parker"@0]        |
+      | [:like "Marco Belinelli"->"Tim Duncan"@0]   |                       | [:like "Rudy Gay"->"LaMarcus Aldridge"@0]       |                     | [:teammate "Manu Ginobili"->"Tony Parker"@0]     |
+      | [:like "Shaquile O\'Neal"->"Tim Duncan"@0]  |                       | [:like "Tony Parker"->"LaMarcus Aldridge"@0]    |                     | [:teammate "Tony Parker"->"LaMarcus Aldridge"@0] |
+      | [:like "Tiago Splitter"->"Tim Duncan"@0]    |                       | [:like "Danny Green"->"Marco Belinelli"@0]      |                     | [:teammate "Tony Parker"->"Manu Ginobili"@0]     |
+      | [:like "Tony Parker"->"Tim Duncan"@0]       |                       | [:like "Dejounte Murray"->"Marco Belinelli"@0]  |                     |                                                  |
+      |                                             |                       | [:like "Dejounte Murray"->"Danny Green"@0]      |                     |                                                  |
+      |                                             |                       | [:like "Marco Belinelli"->"Danny Green"@0]      |                     |                                                  |
+      |                                             |                       | [:like "Boris Diaw"->"Tony Parker"@0]           |                     |                                                  |
+      |                                             |                       | [:like "Dejounte Murray"->"Tony Parker"@0]      |                     |                                                  |
+      |                                             |                       | [:like "LaMarcus Aldridge"->"Tony Parker"@0]    |                     |                                                  |
+      |                                             |                       | [:like "Marco Belinelli"->"Tony Parker"@0]      |                     |                                                  |
+      |                                             |                       | [:like "Tim Duncan"->"Tony Parker"@0]           |                     |                                                  |
     Then the result should be, in any order, with relax comparison:
-      | _vertices | _edges |
-      | vertex1   | edge1  |
-      | vertex2   | edge2  |
-      | vertex3   | edge3  |
+      | _vertices        | _edges    |
+      | [("Tim Duncan")] | <[edge1]> |
+      | <[vertex2]>      | <[edge2]> |
+      | <[vertex3]>      | <[edge3]> |
 
   Scenario: Integer Vid in and out edge
     When executing query:
       """
       GET SUBGRAPH 2 STEPS FROM hash('Tim Duncan') IN like OUT serve
       """
-    Then example
-      | vertex1        | edge1                                       | vertex2               | edge2                                           | vertex3            | edge3                                            |
-      | ("Tim Duncan") | [:serve "Tim Duncan"->"Spurs"@0]            | ("Manu Ginobili")     | [:serve "Manu Ginobili"->"Spurs"@0]             | ("Raptors")        | [:serve "Rudy Gay"->"Raptors"@0]                 |
-      |                | [:like "Aron Baynes"->"Tim Duncan"@0]       | ("Danny Green")       | [:like "Dejounte Murray"->"Manu Ginobili"@0]    | ("Jazz")           | [:serve "Damian Lillard"->"Trail Blazers"@0]     |
-      |                | [:like "Boris Diaw"->"Tim Duncan"@0]        | ("Tony Parker")       | [:like "Tiago Splitter"->"Manu Ginobili"@0]     | ("Cavaliers")      | [:serve "Rudy Gay"->"Kings"@0]                   |
-      |                | [:like "Danny Green"->"Tim Duncan"@0]       | ("Aron Baynes")       | [:like "Tim Duncan"->"Manu Ginobili"@0]         | ("Pistons")        | [:serve "Rudy Gay"->"Spurs"@0]                   |
-      |                | [:like "Dejounte Murray"->"Tim Duncan"@0]   | ("Boris Diaw")        | [:like "Tony Parker"->"Manu Ginobili"@0]        | ("Damian Lillard") | [:teammate "Manu Ginobili"->"Tim Duncan"@0]      |
-      |                | [:like "LaMarcus Aldridge"->"Tim Duncan"@0] | ("Shaquile O\'Neal")  | [:serve "Danny Green"->"Cavaliers"@0]           | ("Kings")          | [:teammate "Tony Parker"->"Tim Duncan"@0]        |
-      |                | [:like "Manu Ginobili"->"Tim Duncan"@0]     | ("Dejounte Murray")   | [:serve "Danny Green"->"Raptors"@0]             | ("Hornets")        | [:teammate "Tim Duncan"->"Danny Green"@0]        |
-      |                | [:like "Marco Belinelli"->"Tim Duncan"@0]   | ("LaMarcus Aldridge") | [:serve "Danny Green"->"Spurs"@0]               | ("Spurs")          | [:teammate "Tim Duncan"->"LaMarcus Aldridge"@0]  |
-      |                | [:like "Shaquile O\'Neal"->"Tim Duncan"@0]  | ("Marco Belinelli")   | [:like "Dejounte Murray"->"Danny Green"@0]      | ("Rudy Gay")       | [:teammate "Tim Duncan"->"Manu Ginobili"@0]      |
-      |                | [:like "Tiago Splitter"->"Tim Duncan"@0]    | ("Tiago Splitter")    | [:like "Marco Belinelli"->"Danny Green"@0]      | ("Yao Ming")       | [:teammate "Tim Duncan"->"Tony Parker"@0]        |
-      |                | [:like "Tony Parker"->"Tim Duncan"@0]       |                       | [:serve "Tony Parker"->"Hornets"@0]             | ("Hawks")          | [:teammate "Manu Ginobili"->"Tony Parker"@0]     |
-      |                |                                             |                       | [:serve "Tony Parker"->"Spurs"@0]               | ("Heat")           | [:teammate "Tony Parker"->"LaMarcus Aldridge"@0] |
-      |                |                                             |                       | [:like "Boris Diaw"->"Tony Parker"@0]           | ("Lakers")         | [:teammate "Tony Parker"->"Manu Ginobili"@0]     |
-      |                |                                             |                       | [:like "Dejounte Murray"->"Tony Parker"@0]      | ("Celtics")        |                                                  |
-      |                |                                             |                       | [:like "LaMarcus Aldridge"->"Tony Parker"@0]    | ("Suns")           |                                                  |
-      |                |                                             |                       | [:like "Marco Belinelli"->"Tony Parker"@0]      | ("Magic")          |                                                  |
-      |                |                                             |                       | [:like "Tim Duncan"->"Tony Parker"@0]           | ("Trail Blazers")  |                                                  |
-      |                |                                             |                       | [:serve "Aron Baynes"->"Celtics"@0]             | ("76ers")          |                                                  |
-      |                |                                             |                       | [:serve "Aron Baynes"->"Pistons"@0]             | ("Bulls")          |                                                  |
-      |                |                                             |                       | [:serve "Aron Baynes"->"Spurs"@0]               | ("Warriors")       |                                                  |
-      |                |                                             |                       | [:serve "Boris Diaw"->"Hawks"@0]                |                    |                                                  |
-      |                |                                             |                       | [:serve "Boris Diaw"->"Hornets"@0]              |                    |                                                  |
-      |                |                                             |                       | [:serve "Boris Diaw"->"Jazz"@0]                 |                    |                                                  |
-      |                |                                             |                       | [:serve "Boris Diaw"->"Spurs"@0]                |                    |                                                  |
-      |                |                                             |                       | [:serve "Boris Diaw"->"Suns"@0]                 |                    |                                                  |
-      |                |                                             |                       | [:serve "Shaquile O\'Neal"->"Cavaliers"@0]      |                    |                                                  |
-      |                |                                             |                       | [:serve "Shaquile O\'Neal"->"Celtics"@0]        |                    |                                                  |
-      |                |                                             |                       | [:serve "Shaquile O\'Neal"->"Heat"@0]           |                    |                                                  |
-      |                |                                             |                       | [:serve "Shaquile O\'Neal"->"Lakers"@0]         |                    |                                                  |
-      |                |                                             |                       | [:serve "Shaquile O\'Neal"->"Magic"@0]          |                    |                                                  |
-      |                |                                             |                       | [:serve "Shaquile O\'Neal"->"Suns"@0]           |                    |                                                  |
-      |                |                                             |                       | [:like "Yao Ming"->"Shaquile O\'Neal"@0]        |                    |                                                  |
-      |                |                                             |                       | [:serve "Dejounte Murray"->"Spurs"@0]           |                    |                                                  |
-      |                |                                             |                       | [:serve "LaMarcus Aldridge"->"Spurs"@0]         |                    |                                                  |
-      |                |                                             |                       | [:serve "LaMarcus Aldridge"->"Trail Blazers"@0] |                    |                                                  |
-      |                |                                             |                       | [:like "Damian Lillard"->"LaMarcus Aldridge"@0] |                    |                                                  |
-      |                |                                             |                       | [:like "Rudy Gay"->"LaMarcus Aldridge"@0]       |                    |                                                  |
-      |                |                                             |                       | [:like "Tony Parker"->"LaMarcus Aldridge"@0]    |                    |                                                  |
-      |                |                                             |                       | [:serve "Marco Belinelli"->"76ers"@0]           |                    |                                                  |
-      |                |                                             |                       | [:serve "Marco Belinelli"->"Bulls"@0]           |                    |                                                  |
-      |                |                                             |                       | [:serve "Marco Belinelli"->"Hawks"@0]           |                    |                                                  |
-      |                |                                             |                       | [:serve "Marco Belinelli"->"Hornets"@0]         |                    |                                                  |
-      |                |                                             |                       | [:serve "Marco Belinelli"->"Kings"@0]           |                    |                                                  |
-      |                |                                             |                       | [:serve "Marco Belinelli"->"Raptors"@0]         |                    |                                                  |
-      |                |                                             |                       | [:serve "Marco Belinelli"->"Spurs"@0]           |                    |                                                  |
-      |                |                                             |                       | [:serve "Marco Belinelli"->"Warriors"@0]        |                    |                                                  |
-      |                |                                             |                       | [:serve "Marco Belinelli"->"Hornets"@1]         |                    |                                                  |
-      |                |                                             |                       | [:serve "Marco Belinelli"->"Spurs"@1]           |                    |                                                  |
-      |                |                                             |                       | [:like "Danny Green"->"Marco Belinelli"@0]      |                    |                                                  |
-      |                |                                             |                       | [:like "Dejounte Murray"->"Marco Belinelli"@0]  |                    |                                                  |
-      |                |                                             |                       | [:serve "Tiago Splitter"->"76ers"@0]            |                    |                                                  |
-      |                |                                             |                       | [:serve "Tiago Splitter"->"Hawks"@0]            |                    |                                                  |
-      |                |                                             |                       | [:serve "Tiago Splitter"->"Spurs"@0]            |                    |                                                  |
+    Then define some list variables:
+      | edge1                                       | vertex2               | edge2                                           | vertex3            | edge3                                            |
+      | [:serve "Tim Duncan"->"Spurs"@0]            | ("Manu Ginobili")     | [:serve "Manu Ginobili"->"Spurs"@0]             | ("Raptors")        | [:serve "Rudy Gay"->"Raptors"@0]                 |
+      | [:like "Aron Baynes"->"Tim Duncan"@0]       | ("Danny Green")       | [:like "Dejounte Murray"->"Manu Ginobili"@0]    | ("Jazz")           | [:serve "Damian Lillard"->"Trail Blazers"@0]     |
+      | [:like "Boris Diaw"->"Tim Duncan"@0]        | ("Tony Parker")       | [:like "Tiago Splitter"->"Manu Ginobili"@0]     | ("Cavaliers")      | [:serve "Rudy Gay"->"Kings"@0]                   |
+      | [:like "Danny Green"->"Tim Duncan"@0]       | ("Aron Baynes")       | [:like "Tim Duncan"->"Manu Ginobili"@0]         | ("Pistons")        | [:serve "Rudy Gay"->"Spurs"@0]                   |
+      | [:like "Dejounte Murray"->"Tim Duncan"@0]   | ("Boris Diaw")        | [:like "Tony Parker"->"Manu Ginobili"@0]        | ("Damian Lillard") | [:teammate "Manu Ginobili"->"Tim Duncan"@0]      |
+      | [:like "LaMarcus Aldridge"->"Tim Duncan"@0] | ("Shaquile O\'Neal")  | [:serve "Danny Green"->"Cavaliers"@0]           | ("Kings")          | [:teammate "Tony Parker"->"Tim Duncan"@0]        |
+      | [:like "Manu Ginobili"->"Tim Duncan"@0]     | ("Dejounte Murray")   | [:serve "Danny Green"->"Raptors"@0]             | ("Hornets")        | [:teammate "Tim Duncan"->"Danny Green"@0]        |
+      | [:like "Marco Belinelli"->"Tim Duncan"@0]   | ("LaMarcus Aldridge") | [:serve "Danny Green"->"Spurs"@0]               | ("Spurs")          | [:teammate "Tim Duncan"->"LaMarcus Aldridge"@0]  |
+      | [:like "Shaquile O\'Neal"->"Tim Duncan"@0]  | ("Marco Belinelli")   | [:like "Dejounte Murray"->"Danny Green"@0]      | ("Rudy Gay")       | [:teammate "Tim Duncan"->"Manu Ginobili"@0]      |
+      | [:like "Tiago Splitter"->"Tim Duncan"@0]    | ("Tiago Splitter")    | [:like "Marco Belinelli"->"Danny Green"@0]      | ("Yao Ming")       | [:teammate "Tim Duncan"->"Tony Parker"@0]        |
+      | [:like "Tony Parker"->"Tim Duncan"@0]       |                       | [:serve "Tony Parker"->"Hornets"@0]             | ("Hawks")          | [:teammate "Manu Ginobili"->"Tony Parker"@0]     |
+      |                                             |                       | [:serve "Tony Parker"->"Spurs"@0]               | ("Heat")           | [:teammate "Tony Parker"->"LaMarcus Aldridge"@0] |
+      |                                             |                       | [:like "Boris Diaw"->"Tony Parker"@0]           | ("Lakers")         | [:teammate "Tony Parker"->"Manu Ginobili"@0]     |
+      |                                             |                       | [:like "Dejounte Murray"->"Tony Parker"@0]      | ("Celtics")        |                                                  |
+      |                                             |                       | [:like "LaMarcus Aldridge"->"Tony Parker"@0]    | ("Suns")           |                                                  |
+      |                                             |                       | [:like "Marco Belinelli"->"Tony Parker"@0]      | ("Magic")          |                                                  |
+      |                                             |                       | [:like "Tim Duncan"->"Tony Parker"@0]           | ("Trail Blazers")  |                                                  |
+      |                                             |                       | [:serve "Aron Baynes"->"Celtics"@0]             | ("76ers")          |                                                  |
+      |                                             |                       | [:serve "Aron Baynes"->"Pistons"@0]             | ("Bulls")          |                                                  |
+      |                                             |                       | [:serve "Aron Baynes"->"Spurs"@0]               | ("Warriors")       |                                                  |
+      |                                             |                       | [:serve "Boris Diaw"->"Hawks"@0]                |                    |                                                  |
+      |                                             |                       | [:serve "Boris Diaw"->"Hornets"@0]              |                    |                                                  |
+      |                                             |                       | [:serve "Boris Diaw"->"Jazz"@0]                 |                    |                                                  |
+      |                                             |                       | [:serve "Boris Diaw"->"Spurs"@0]                |                    |                                                  |
+      |                                             |                       | [:serve "Boris Diaw"->"Suns"@0]                 |                    |                                                  |
+      |                                             |                       | [:serve "Shaquile O\'Neal"->"Cavaliers"@0]      |                    |                                                  |
+      |                                             |                       | [:serve "Shaquile O\'Neal"->"Celtics"@0]        |                    |                                                  |
+      |                                             |                       | [:serve "Shaquile O\'Neal"->"Heat"@0]           |                    |                                                  |
+      |                                             |                       | [:serve "Shaquile O\'Neal"->"Lakers"@0]         |                    |                                                  |
+      |                                             |                       | [:serve "Shaquile O\'Neal"->"Magic"@0]          |                    |                                                  |
+      |                                             |                       | [:serve "Shaquile O\'Neal"->"Suns"@0]           |                    |                                                  |
+      |                                             |                       | [:like "Yao Ming"->"Shaquile O\'Neal"@0]        |                    |                                                  |
+      |                                             |                       | [:serve "Dejounte Murray"->"Spurs"@0]           |                    |                                                  |
+      |                                             |                       | [:serve "LaMarcus Aldridge"->"Spurs"@0]         |                    |                                                  |
+      |                                             |                       | [:serve "LaMarcus Aldridge"->"Trail Blazers"@0] |                    |                                                  |
+      |                                             |                       | [:like "Damian Lillard"->"LaMarcus Aldridge"@0] |                    |                                                  |
+      |                                             |                       | [:like "Rudy Gay"->"LaMarcus Aldridge"@0]       |                    |                                                  |
+      |                                             |                       | [:like "Tony Parker"->"LaMarcus Aldridge"@0]    |                    |                                                  |
+      |                                             |                       | [:serve "Marco Belinelli"->"76ers"@0]           |                    |                                                  |
+      |                                             |                       | [:serve "Marco Belinelli"->"Bulls"@0]           |                    |                                                  |
+      |                                             |                       | [:serve "Marco Belinelli"->"Hawks"@0]           |                    |                                                  |
+      |                                             |                       | [:serve "Marco Belinelli"->"Hornets"@0]         |                    |                                                  |
+      |                                             |                       | [:serve "Marco Belinelli"->"Kings"@0]           |                    |                                                  |
+      |                                             |                       | [:serve "Marco Belinelli"->"Raptors"@0]         |                    |                                                  |
+      |                                             |                       | [:serve "Marco Belinelli"->"Spurs"@0]           |                    |                                                  |
+      |                                             |                       | [:serve "Marco Belinelli"->"Warriors"@0]        |                    |                                                  |
+      |                                             |                       | [:serve "Marco Belinelli"->"Hornets"@1]         |                    |                                                  |
+      |                                             |                       | [:serve "Marco Belinelli"->"Spurs"@1]           |                    |                                                  |
+      |                                             |                       | [:like "Danny Green"->"Marco Belinelli"@0]      |                    |                                                  |
+      |                                             |                       | [:like "Dejounte Murray"->"Marco Belinelli"@0]  |                    |                                                  |
+      |                                             |                       | [:serve "Tiago Splitter"->"76ers"@0]            |                    |                                                  |
+      |                                             |                       | [:serve "Tiago Splitter"->"Hawks"@0]            |                    |                                                  |
+      |                                             |                       | [:serve "Tiago Splitter"->"Spurs"@0]            |                    |                                                  |
     Then the result should be, in any order, with relax comparison:
-      | _vertices | _edges |
-      | vertex1   | edge1  |
-      | vertex2   | edge2  |
-      | vertex3   | edge3  |
+      | _vertices        | _edges    |
+      | [("Tim Duncan")] | <[edge1]> |
+      | <[vertex2]>      | <[edge2]> |
+      | <[vertex3]>      | <[edge3]> |
 
   Scenario: Integer Vid two steps in and out edge
     When executing query:
       """
       GET SUBGRAPH 2 STEPS FROM hash('Tim Duncan'), hash('James Harden') IN teammate OUT serve
       """
-    Then example
-      | vertex1          | edge1                                       | vertex2           | edge2                                        | vertex3     | edge3                                    |
-      | ("Tim Duncan")   | [:serve "Tim Duncan"->"Spurs"@0]            | ("Manu Ginobili") | [:serve "Manu Ginobili"->"Spurs"@0]          | ("Hornets") | [:like "Manu Ginobili"->"Tim Duncan"@0]  |
-      | ("James Harden") | [:teammate "Manu Ginobili"->"Tim Duncan"@0] | ("Tony Parker")   | [:teammate "Tim Duncan"->"Manu Ginobili"@0]  | ("Spurs")   | [:like "Tony Parker"->"Tim Duncan"@0]    |
-      |                  | [:teammate "Tony Parker"->"Tim Duncan"@0]   |                   | [:teammate "Tony Parker"->"Manu Ginobili"@0] |             | [:like "Tim Duncan"->"Manu Ginobili"@0]  |
-      |                  | [:serve "James Harden"->"Rockets"@0]        |                   | [:serve "Tony Parker"->"Hornets"@0]          |             | [:like "Tim Duncan"->"Tony Parker"@0]    |
-      |                  | [:serve "James Harden"->"Thunders"@0]       |                   | [:serve "Tony Parker"->"Spurs"@0]            |             | [:like "Tony Parker"->"Manu Ginobili"@0] |
-      |                  |                                             |                   | [:teammate "Manu Ginobili"->"Tony Parker"@0] |             |                                          |
-      |                  |                                             |                   | [:teammate "Tim Duncan"->"Tony Parker"@0]    |             |                                          |
+    Then define some list variables:
+      | edge1                                       | edge2                                        | edge3                                    |
+      | [:serve "Tim Duncan"->"Spurs"@0]            | [:serve "Manu Ginobili"->"Spurs"@0]          | [:like "Manu Ginobili"->"Tim Duncan"@0]  |
+      | [:teammate "Manu Ginobili"->"Tim Duncan"@0] | [:teammate "Tim Duncan"->"Manu Ginobili"@0]  | [:like "Tony Parker"->"Tim Duncan"@0]    |
+      | [:teammate "Tony Parker"->"Tim Duncan"@0]   | [:teammate "Tony Parker"->"Manu Ginobili"@0] | [:like "Tim Duncan"->"Manu Ginobili"@0]  |
+      | [:serve "James Harden"->"Rockets"@0]        | [:serve "Tony Parker"->"Hornets"@0]          | [:like "Tim Duncan"->"Tony Parker"@0]    |
+      | [:serve "James Harden"->"Thunders"@0]       | [:serve "Tony Parker"->"Spurs"@0]            | [:like "Tony Parker"->"Manu Ginobili"@0] |
+      |                                             | [:teammate "Manu Ginobili"->"Tony Parker"@0] |                                          |
+      |                                             | [:teammate "Tim Duncan"->"Tony Parker"@0]    |                                          |
     Then the result should be, in any order, with relax comparison:
-      | _vertices | _edges |
-      | vertex1   | edge1  |
-      | vertex2   | edge2  |
-      | vertex3   | edge3  |
+      | _vertices                            | _edges    |
+      | [("Tim Duncan"), ("James Harden")]   | <[edge1]> |
+      | [("Manu Ginobili"), ("Tony Parker")] | <[edge2]> |
+      | [("Hornets"), ("Spurs")]             | <[edge3]> |
 
   Scenario: Integer Vid three steps
     When executing query:
       """
       GET SUBGRAPH 3 STEPS FROM hash('Paul George') OUT serve BOTH like
       """
-    Then example
-      | vertex1         | edge1                                        | vertex2               | edge2                                            | vertex3             | edge3                                          | vertex4             | edge4                                        |
-      | ("Paul George") | [:like "Russell Westbrook"->"Paul George"@0] | ("Russell Westbrook") | [:like "Dejounte Murray"->"Russell Westbrook"@0] | ("Dejounte Murray") | [:serve "Dejounte Murray"->"Spurs"@0]          | ("LeBron James")    | [:like "Chris Paul"->"LeBron James"@0]       |
-      |                 | [:serve "Paul George"->"Pacers"@0]           |                       | [:like "James Harden"->"Russell Westbrook"@0]    | ("James Harden")    | [:like "Dejounte Murray"->"Chris Paul"@0]      | ("Marco Belinelli") | [:like "Danny Green"->"LeBron James"@0]      |
-      |                 | [:serve "Paul George"->"Thunders"@0]         |                       | [:serve "Russell Westbrook"->"Thunders"@0]       |                     | [:like "Dejounte Murray"->"Danny Green"@0]     | ("Danny Green")     | [:like "Danny Green"->"Marco Belinelli"@0]   |
-      |                 | [:like "Paul George"->"Russell Westbrook"@0] |                       | [:like "Russell Westbrook"->"James Harden"@0]    |                     | [:like "Dejounte Murray"->"James Harden"@0]    | ("Rockets")         | [:like "Marco Belinelli"->"Danny Green"@0]   |
-      |                 |                                              |                       |                                                  |                     | [:like "Dejounte Murray"->"Kevin Durant"@0]    | ("Spurs")           | [:like "Marco Belinelli"->"Tim Duncan"@0]    |
-      |                 |                                              |                       |                                                  |                     | [:like "Dejounte Murray"->"Kyle Anderson"@0]   | ("Kevin Durant")    | [:like "Marco Belinelli"->"Tony Parker"@0]   |
-      |                 |                                              |                       |                                                  |                     | [:like "Dejounte Murray"->"LeBron James"@0]    | ("Kyle Anderson")   | [:serve "Marco Belinelli"->"Spurs"@0]        |
-      |                 |                                              |                       |                                                  |                     | [:like "Dejounte Murray"->"Manu Ginobili"@0]   | ("Tim Duncan")      | [:serve "Marco Belinelli"->"Spurs"@1]        |
-      |                 |                                              |                       |                                                  |                     | [:like "Dejounte Murray"->"Marco Belinelli"@0] | ("Tony Parker")     | [:teammate "Tim Duncan"->"Danny Green"@0]    |
-      |                 |                                              |                       |                                                  |                     | [:like "Dejounte Murray"->"Tim Duncan"@0]      | ("Chris Paul")      | [:like "Danny Green"->"Tim Duncan"@0]        |
-      |                 |                                              |                       |                                                  |                     | [:like "Dejounte Murray"->"Tony Parker"@0]     | ("Luka Doncic")     | [:serve "Danny Green"->"Spurs"@0]            |
-      |                 |                                              |                       |                                                  |                     | [:like "Luka Doncic"->"James Harden"@0]        | ("Manu Ginobili")   | [:serve "Chris Paul"->"Rockets"@0]           |
-      |                 |                                              |                       |                                                  |                     | [:serve "James Harden"->"Rockets"@0]           | ("Pacers")          | [:serve "Kyle Anderson"->"Spurs"@0]          |
-      |                 |                                              |                       |                                                  |                     | [:serve "James Harden"->"Thunders"@0]          | ("Thunders")        | [:serve "Manu Ginobili"->"Spurs"@0]          |
-      |                 |                                              |                       |                                                  |                     |                                                |                     | [:serve "Tim Duncan"->"Spurs"@0]             |
-      |                 |                                              |                       |                                                  |                     |                                                |                     | [:serve "Tony Parker"->"Spurs"@0]            |
-      |                 |                                              |                       |                                                  |                     |                                                |                     | [:serve "Kevin Durant"->"Thunders"@0]        |
-      |                 |                                              |                       |                                                  |                     |                                                |                     | [:teammate "Tony Parker"->"Kyle Anderson"@0] |
-      |                 |                                              |                       |                                                  |                     |                                                |                     | [:teammate "Manu Ginobili"->"Tim Duncan"@0]  |
-      |                 |                                              |                       |                                                  |                     |                                                |                     | [:teammate "Tony Parker"->"Tim Duncan"@0]    |
-      |                 |                                              |                       |                                                  |                     |                                                |                     | [:like "Manu Ginobili"->"Tim Duncan"@0]      |
-      |                 |                                              |                       |                                                  |                     |                                                |                     | [:like "Tony Parker"->"Tim Duncan"@0]        |
-      |                 |                                              |                       |                                                  |                     |                                                |                     | [:like "Tim Duncan"->"Manu Ginobili"@0]      |
-      |                 |                                              |                       |                                                  |                     |                                                |                     | [:like "Tim Duncan"->"Tony Parker"@0]        |
-      |                 |                                              |                       |                                                  |                     |                                                |                     | [:teammate "Tim Duncan"->"Manu Ginobili"@0]  |
-      |                 |                                              |                       |                                                  |                     |                                                |                     | [:teammate "Tim Duncan"->"Tony Parker"@0]    |
-      |                 |                                              |                       |                                                  |                     |                                                |                     | [:teammate "Manu Ginobili"->"Tony Parker"@0] |
-      |                 |                                              |                       |                                                  |                     |                                                |                     | [:like "Tony Parker"->"Manu Ginobili"@0]     |
-      |                 |                                              |                       |                                                  |                     |                                                |                     | [:teammate "Tony Parker"->"Manu Ginobili"@0] |
+    Then define some list variables:
+      | edge1                                        | edge2                                            | edge3                                          | vertex4             | edge4                                        |
+      | [:like "Russell Westbrook"->"Paul George"@0] | [:like "Dejounte Murray"->"Russell Westbrook"@0] | [:serve "Dejounte Murray"->"Spurs"@0]          | ("LeBron James")    | [:like "Chris Paul"->"LeBron James"@0]       |
+      | [:serve "Paul George"->"Pacers"@0]           | [:like "James Harden"->"Russell Westbrook"@0]    | [:like "Dejounte Murray"->"Chris Paul"@0]      | ("Marco Belinelli") | [:like "Danny Green"->"LeBron James"@0]      |
+      | [:serve "Paul George"->"Thunders"@0]         | [:serve "Russell Westbrook"->"Thunders"@0]       | [:like "Dejounte Murray"->"Danny Green"@0]     | ("Danny Green")     | [:like "Danny Green"->"Marco Belinelli"@0]   |
+      | [:like "Paul George"->"Russell Westbrook"@0] | [:like "Russell Westbrook"->"James Harden"@0]    | [:like "Dejounte Murray"->"James Harden"@0]    | ("Rockets")         | [:like "Marco Belinelli"->"Danny Green"@0]   |
+      |                                              |                                                  | [:like "Dejounte Murray"->"Kevin Durant"@0]    | ("Spurs")           | [:like "Marco Belinelli"->"Tim Duncan"@0]    |
+      |                                              |                                                  | [:like "Dejounte Murray"->"Kyle Anderson"@0]   | ("Kevin Durant")    | [:like "Marco Belinelli"->"Tony Parker"@0]   |
+      |                                              |                                                  | [:like "Dejounte Murray"->"LeBron James"@0]    | ("Kyle Anderson")   | [:serve "Marco Belinelli"->"Spurs"@0]        |
+      |                                              |                                                  | [:like "Dejounte Murray"->"Manu Ginobili"@0]   | ("Tim Duncan")      | [:serve "Marco Belinelli"->"Spurs"@1]        |
+      |                                              |                                                  | [:like "Dejounte Murray"->"Marco Belinelli"@0] | ("Tony Parker")     | [:teammate "Tim Duncan"->"Danny Green"@0]    |
+      |                                              |                                                  | [:like "Dejounte Murray"->"Tim Duncan"@0]      | ("Chris Paul")      | [:like "Danny Green"->"Tim Duncan"@0]        |
+      |                                              |                                                  | [:like "Dejounte Murray"->"Tony Parker"@0]     | ("Luka Doncic")     | [:serve "Danny Green"->"Spurs"@0]            |
+      |                                              |                                                  | [:like "Luka Doncic"->"James Harden"@0]        | ("Manu Ginobili")   | [:serve "Chris Paul"->"Rockets"@0]           |
+      |                                              |                                                  | [:serve "James Harden"->"Rockets"@0]           | ("Pacers")          | [:serve "Kyle Anderson"->"Spurs"@0]          |
+      |                                              |                                                  | [:serve "James Harden"->"Thunders"@0]          | ("Thunders")        | [:serve "Manu Ginobili"->"Spurs"@0]          |
+      |                                              |                                                  |                                                |                     | [:serve "Tim Duncan"->"Spurs"@0]             |
+      |                                              |                                                  |                                                |                     | [:serve "Tony Parker"->"Spurs"@0]            |
+      |                                              |                                                  |                                                |                     | [:serve "Kevin Durant"->"Thunders"@0]        |
+      |                                              |                                                  |                                                |                     | [:teammate "Tony Parker"->"Kyle Anderson"@0] |
+      |                                              |                                                  |                                                |                     | [:teammate "Manu Ginobili"->"Tim Duncan"@0]  |
+      |                                              |                                                  |                                                |                     | [:teammate "Tony Parker"->"Tim Duncan"@0]    |
+      |                                              |                                                  |                                                |                     | [:like "Manu Ginobili"->"Tim Duncan"@0]      |
+      |                                              |                                                  |                                                |                     | [:like "Tony Parker"->"Tim Duncan"@0]        |
+      |                                              |                                                  |                                                |                     | [:like "Tim Duncan"->"Manu Ginobili"@0]      |
+      |                                              |                                                  |                                                |                     | [:like "Tim Duncan"->"Tony Parker"@0]        |
+      |                                              |                                                  |                                                |                     | [:teammate "Tim Duncan"->"Manu Ginobili"@0]  |
+      |                                              |                                                  |                                                |                     | [:teammate "Tim Duncan"->"Tony Parker"@0]    |
+      |                                              |                                                  |                                                |                     | [:teammate "Manu Ginobili"->"Tony Parker"@0] |
+      |                                              |                                                  |                                                |                     | [:like "Tony Parker"->"Manu Ginobili"@0]     |
+      |                                              |                                                  |                                                |                     | [:teammate "Tony Parker"->"Manu Ginobili"@0] |
     Then the result should be, in any order, with relax comparison:
-      | _vertices | _edges |
-      | vertex1   | edge1  |
-      | vertex2   | edge2  |
-      | vertex3   | edge3  |
-      | vertex4   | edge4  |
+      | _vertices                               | _edges    |
+      | [("Paul George")]                       | <[edge1]> |
+      | [("Russell Westbrook")]                 | <[edge2]> |
+      | [("Dejounte Murray"), ("James Harden")] | <[edge3]> |
+      | <[vertex4]>                             | <[edge4]> |
 
   Scenario: Integer Vid bidirect edge
     When executing query:
       """
       GET SUBGRAPH FROM hash('Tony Parker') BOTH like
       """
-    Then example
-      | vertex1         | edge1                                        | vertex2               | edge2                                            |
-      | ("Tony Parker") | [:like "Boris Diaw"->"Tony Parker"@0]        | ("Dejounte Murray")   | [:like "Dejounte Murray"->"Manu Ginobili"@0]     |
-      |                 | [:like "Dejounte Murray"->"Tony Parker"@0]   | ("LaMarcus Aldridge") | [:like "Dejounte Murray"->"Marco Belinelli"@0]   |
-      |                 | [:like "LaMarcus Aldridge"->"Tony Parker"@0] | ("Marco Belinelli")   | [:like "Dejounte Murray"->"Tim Duncan"@0]        |
-      |                 | [:like "Marco Belinelli"->"Tony Parker"@0]   | ("Boris Diaw")        | [:teammate "Tim Duncan"->"LaMarcus Aldridge"@0]  |
-      |                 | [:like "Tim Duncan"->"Tony Parker"@0]        | ("Tim Duncan")        | [:teammate "Tony Parker"->"LaMarcus Aldridge"@0] |
-      |                 | [:like "Tony Parker"->"LaMarcus Aldridge"@0] | ("Manu Ginobili")     | [:like "LaMarcus Aldridge"->"Tim Duncan"@0]      |
-      |                 | [:like "Tony Parker"->"Manu Ginobili"@0]     |                       | [:like "Marco Belinelli"->"Tim Duncan"@0]        |
-      |                 | [:like "Tony Parker"->"Tim Duncan"@0]        |                       | [:like "Boris Diaw"->"Tim Duncan"@0]             |
-      |                 |                                              |                       | [:teammate "Manu Ginobili"->"Tim Duncan"@0]      |
-      |                 |                                              |                       | [:teammate "Tony Parker"->"Tim Duncan"@0]        |
-      |                 |                                              |                       | [:like "Manu Ginobili"->"Tim Duncan"@0]          |
-      |                 |                                              |                       | [:like "Tim Duncan"->"Manu Ginobili"@0]          |
-      |                 |                                              |                       | [:teammate "Tim Duncan"->"Manu Ginobili"@0]      |
-      |                 |                                              |                       | [:teammate "Tim Duncan"->"Tony Parker"@0]        |
-      |                 |                                              |                       | [:teammate "Tony Parker"->"Manu Ginobili"@0]     |
-      |                 |                                              |                       | [:teammate "Manu Ginobili"->"Tony Parker"@0]     |
+    Then define some list variables:
+      | edge1                                        | vertex2               | edge2                                            |
+      | [:like "Boris Diaw"->"Tony Parker"@0]        | ("Dejounte Murray")   | [:like "Dejounte Murray"->"Manu Ginobili"@0]     |
+      | [:like "Dejounte Murray"->"Tony Parker"@0]   | ("LaMarcus Aldridge") | [:like "Dejounte Murray"->"Marco Belinelli"@0]   |
+      | [:like "LaMarcus Aldridge"->"Tony Parker"@0] | ("Marco Belinelli")   | [:like "Dejounte Murray"->"Tim Duncan"@0]        |
+      | [:like "Marco Belinelli"->"Tony Parker"@0]   | ("Boris Diaw")        | [:teammate "Tim Duncan"->"LaMarcus Aldridge"@0]  |
+      | [:like "Tim Duncan"->"Tony Parker"@0]        | ("Tim Duncan")        | [:teammate "Tony Parker"->"LaMarcus Aldridge"@0] |
+      | [:like "Tony Parker"->"LaMarcus Aldridge"@0] | ("Manu Ginobili")     | [:like "LaMarcus Aldridge"->"Tim Duncan"@0]      |
+      | [:like "Tony Parker"->"Manu Ginobili"@0]     |                       | [:like "Marco Belinelli"->"Tim Duncan"@0]        |
+      | [:like "Tony Parker"->"Tim Duncan"@0]        |                       | [:like "Boris Diaw"->"Tim Duncan"@0]             |
+      |                                              |                       | [:teammate "Manu Ginobili"->"Tim Duncan"@0]      |
+      |                                              |                       | [:teammate "Tony Parker"->"Tim Duncan"@0]        |
+      |                                              |                       | [:like "Manu Ginobili"->"Tim Duncan"@0]          |
+      |                                              |                       | [:like "Tim Duncan"->"Manu Ginobili"@0]          |
+      |                                              |                       | [:teammate "Tim Duncan"->"Manu Ginobili"@0]      |
+      |                                              |                       | [:teammate "Tim Duncan"->"Tony Parker"@0]        |
+      |                                              |                       | [:teammate "Tony Parker"->"Manu Ginobili"@0]     |
+      |                                              |                       | [:teammate "Manu Ginobili"->"Tony Parker"@0]     |
     Then the result should be, in any order, with relax comparison:
-      | _vertices | _edges |
-      | vertex1   | edge1  |
-      | vertex2   | edge2  |
+      | _vertices         | _edges    |
+      | [("Tony Parker")] | <[edge1]> |
+      | <[vertex2]>       | <[edge2]> |
 
   Scenario: Integer Vid pipe
     When executing query:
       """
       GO FROM hash('Tim Duncan') over serve YIELD serve._src AS id | GET SUBGRAPH FROM $-.id
       """
-    Then example
-      | vertex1        | edge1                                           | vertex2               | edge2                                            |
-      | ("Tim Duncan") | [:teammate "Manu Ginobili"->"Tim Duncan"@0]     | ("Danny Green")       | [:like "Dejounte Murray"->"Danny Green"@0]       |
-      |                | [:teammate "Tony Parker"->"Tim Duncan"@0]       | ("Manu Ginobili")     | [:like "Marco Belinelli"->"Danny Green"@0]       |
-      |                | [:like "Aron Baynes"->"Tim Duncan"@0]           | ("Aron Baynes")       | [:like "Danny Green"->"Marco Belinelli"@0]       |
-      |                | [:like "Boris Diaw"->"Tim Duncan"@0]            | ("Boris Diaw")        | [:serve "Danny Green"->"Spurs"@0]                |
-      |                | [:like "Danny Green"->"Tim Duncan"@0]           | ("Shaquile O\'Neal")  | [:teammate "Tony Parker"->"Manu Ginobili"@0]     |
-      |                | [:like "Dejounte Murray"->"Tim Duncan"@0]       | ("Tony Parker")       | [:like "Dejounte Murray"->"Manu Ginobili"@0]     |
-      |                | [:like "LaMarcus Aldridge"->"Tim Duncan"@0]     | ("Spurs")             | [:like "Tiago Splitter"->"Manu Ginobili"@0]      |
-      |                | [:like "Manu Ginobili"->"Tim Duncan"@0]         | ("Dejounte Murray")   | [:like "Tony Parker"->"Manu Ginobili"@0]         |
-      |                | [:like "Marco Belinelli"->"Tim Duncan"@0]       | ("LaMarcus Aldridge") | [:serve "Manu Ginobili"->"Spurs"@0]              |
-      |                | [:like "Shaquile O\'Neal"->"Tim Duncan"@0]      | ("Marco Belinelli")   | [:teammate "Manu Ginobili"->"Tony Parker"@0]     |
-      |                | [:like "Tiago Splitter"->"Tim Duncan"@0]        | ("Tiago Splitter")    | [:serve "Aron Baynes"->"Spurs"@0]                |
-      |                | [:like "Tony Parker"->"Tim Duncan"@0]           |                       | [:like "Boris Diaw"->"Tony Parker"@0]            |
-      |                | [:like "Tim Duncan"->"Manu Ginobili"@0]         |                       | [:serve "Boris Diaw"->"Spurs"@0]                 |
-      |                | [:like "Tim Duncan"->"Tony Parker"@0]           |                       | [:like "Dejounte Murray"->"Tony Parker"@0]       |
-      |                | [:serve "Tim Duncan"->"Spurs"@0]                |                       | [:like "LaMarcus Aldridge"->"Tony Parker"@0]     |
-      |                | [:teammate "Tim Duncan"->"Danny Green"@0]       |                       | [:like "Marco Belinelli"->"Tony Parker"@0]       |
-      |                | [:teammate "Tim Duncan"->"LaMarcus Aldridge"@0] |                       | [:like "Tony Parker"->"LaMarcus Aldridge"@0]     |
-      |                | [:teammate "Tim Duncan"->"Manu Ginobili"@0]     |                       | [:serve "Tony Parker"->"Spurs"@0]                |
-      |                | [:teammate "Tim Duncan"->"Tony Parker"@0]       |                       | [:teammate "Tony Parker"->"LaMarcus Aldridge"@0] |
-      |                |                                                 |                       | [:serve "Dejounte Murray"->"Spurs"@0]            |
-      |                |                                                 |                       | [:serve "LaMarcus Aldridge"->"Spurs"@0]          |
-      |                |                                                 |                       | [:serve "Marco Belinelli"->"Spurs"@0]            |
-      |                |                                                 |                       | [:serve "Tiago Splitter"->"Spurs"@0]             |
-      |                |                                                 |                       | [:serve "Marco Belinelli"->"Spurs"@1]            |
-      |                |                                                 |                       | [:like "Dejounte Murray"->"Marco Belinelli"@0]   |
+    Then define some list variables:
+      | edge1                                           | vertex2               | edge2                                            |
+      | [:teammate "Manu Ginobili"->"Tim Duncan"@0]     | ("Danny Green")       | [:like "Dejounte Murray"->"Danny Green"@0]       |
+      | [:teammate "Tony Parker"->"Tim Duncan"@0]       | ("Manu Ginobili")     | [:like "Marco Belinelli"->"Danny Green"@0]       |
+      | [:like "Aron Baynes"->"Tim Duncan"@0]           | ("Aron Baynes")       | [:like "Danny Green"->"Marco Belinelli"@0]       |
+      | [:like "Boris Diaw"->"Tim Duncan"@0]            | ("Boris Diaw")        | [:serve "Danny Green"->"Spurs"@0]                |
+      | [:like "Danny Green"->"Tim Duncan"@0]           | ("Shaquile O\'Neal")  | [:teammate "Tony Parker"->"Manu Ginobili"@0]     |
+      | [:like "Dejounte Murray"->"Tim Duncan"@0]       | ("Tony Parker")       | [:like "Dejounte Murray"->"Manu Ginobili"@0]     |
+      | [:like "LaMarcus Aldridge"->"Tim Duncan"@0]     | ("Spurs")             | [:like "Tiago Splitter"->"Manu Ginobili"@0]      |
+      | [:like "Manu Ginobili"->"Tim Duncan"@0]         | ("Dejounte Murray")   | [:like "Tony Parker"->"Manu Ginobili"@0]         |
+      | [:like "Marco Belinelli"->"Tim Duncan"@0]       | ("LaMarcus Aldridge") | [:serve "Manu Ginobili"->"Spurs"@0]              |
+      | [:like "Shaquile O\'Neal"->"Tim Duncan"@0]      | ("Marco Belinelli")   | [:teammate "Manu Ginobili"->"Tony Parker"@0]     |
+      | [:like "Tiago Splitter"->"Tim Duncan"@0]        | ("Tiago Splitter")    | [:serve "Aron Baynes"->"Spurs"@0]                |
+      | [:like "Tony Parker"->"Tim Duncan"@0]           |                       | [:like "Boris Diaw"->"Tony Parker"@0]            |
+      | [:like "Tim Duncan"->"Manu Ginobili"@0]         |                       | [:serve "Boris Diaw"->"Spurs"@0]                 |
+      | [:like "Tim Duncan"->"Tony Parker"@0]           |                       | [:like "Dejounte Murray"->"Tony Parker"@0]       |
+      | [:serve "Tim Duncan"->"Spurs"@0]                |                       | [:like "LaMarcus Aldridge"->"Tony Parker"@0]     |
+      | [:teammate "Tim Duncan"->"Danny Green"@0]       |                       | [:like "Marco Belinelli"->"Tony Parker"@0]       |
+      | [:teammate "Tim Duncan"->"LaMarcus Aldridge"@0] |                       | [:like "Tony Parker"->"LaMarcus Aldridge"@0]     |
+      | [:teammate "Tim Duncan"->"Manu Ginobili"@0]     |                       | [:serve "Tony Parker"->"Spurs"@0]                |
+      | [:teammate "Tim Duncan"->"Tony Parker"@0]       |                       | [:teammate "Tony Parker"->"LaMarcus Aldridge"@0] |
+      |                                                 |                       | [:serve "Dejounte Murray"->"Spurs"@0]            |
+      |                                                 |                       | [:serve "LaMarcus Aldridge"->"Spurs"@0]          |
+      |                                                 |                       | [:serve "Marco Belinelli"->"Spurs"@0]            |
+      |                                                 |                       | [:serve "Tiago Splitter"->"Spurs"@0]             |
+      |                                                 |                       | [:serve "Marco Belinelli"->"Spurs"@1]            |
+      |                                                 |                       | [:like "Dejounte Murray"->"Marco Belinelli"@0]   |
     Then the result should be, in any order, with relax comparison:
-      | _vertices | _edges |
-      | vertex1   | edge1  |
-      | vertex2   | edge2  |
+      | _vertices        | _edges    |
+      | [("Tim Duncan")] | <[edge1]> |
+      | <[vertex2]>      | <[edge2]> |
 
   Scenario: Integer Vid var
     When executing query:
@@ -446,34 +446,34 @@ Feature: Integer Vid subgraph
       $a = GO FROM hash('Tim Duncan') over serve YIELD serve._src AS id;
       GET SUBGRAPH FROM $a.id
       """
-    Then example
-      | vertex1        | edge1                                           | vertex2               | edge2                                            |
-      | ("Tim Duncan") | [:teammate "Manu Ginobili"->"Tim Duncan"@0]     | ("Danny Green")       | [:like "Dejounte Murray"->"Danny Green"@0]       |
-      |                | [:teammate "Tony Parker"->"Tim Duncan"@0]       | ("Manu Ginobili")     | [:like "Marco Belinelli"->"Danny Green"@0]       |
-      |                | [:like "Aron Baynes"->"Tim Duncan"@0]           | ("Aron Baynes")       | [:like "Danny Green"->"Marco Belinelli"@0]       |
-      |                | [:like "Boris Diaw"->"Tim Duncan"@0]            | ("Boris Diaw")        | [:serve "Danny Green"->"Spurs"@0]                |
-      |                | [:like "Danny Green"->"Tim Duncan"@0]           | ("Shaquile O\'Neal")  | [:teammate "Tony Parker"->"Manu Ginobili"@0]     |
-      |                | [:like "Dejounte Murray"->"Tim Duncan"@0]       | ("Tony Parker")       | [:like "Dejounte Murray"->"Manu Ginobili"@0]     |
-      |                | [:like "LaMarcus Aldridge"->"Tim Duncan"@0]     | ("Spurs")             | [:like "Tiago Splitter"->"Manu Ginobili"@0]      |
-      |                | [:like "Manu Ginobili"->"Tim Duncan"@0]         | ("Dejounte Murray")   | [:like "Tony Parker"->"Manu Ginobili"@0]         |
-      |                | [:like "Marco Belinelli"->"Tim Duncan"@0]       | ("LaMarcus Aldridge") | [:serve "Manu Ginobili"->"Spurs"@0]              |
-      |                | [:like "Shaquile O\'Neal"->"Tim Duncan"@0]      | ("Marco Belinelli")   | [:teammate "Manu Ginobili"->"Tony Parker"@0]     |
-      |                | [:like "Tiago Splitter"->"Tim Duncan"@0]        | ("Tiago Splitter")    | [:serve "Aron Baynes"->"Spurs"@0]                |
-      |                | [:like "Tony Parker"->"Tim Duncan"@0]           |                       | [:like "Boris Diaw"->"Tony Parker"@0]            |
-      |                | [:like "Tim Duncan"->"Manu Ginobili"@0]         |                       | [:serve "Boris Diaw"->"Spurs"@0]                 |
-      |                | [:like "Tim Duncan"->"Tony Parker"@0]           |                       | [:like "Dejounte Murray"->"Tony Parker"@0]       |
-      |                | [:serve "Tim Duncan"->"Spurs"@0]                |                       | [:like "LaMarcus Aldridge"->"Tony Parker"@0]     |
-      |                | [:teammate "Tim Duncan"->"Danny Green"@0]       |                       | [:like "Marco Belinelli"->"Tony Parker"@0]       |
-      |                | [:teammate "Tim Duncan"->"LaMarcus Aldridge"@0] |                       | [:like "Tony Parker"->"LaMarcus Aldridge"@0]     |
-      |                | [:teammate "Tim Duncan"->"Manu Ginobili"@0]     |                       | [:serve "Tony Parker"->"Spurs"@0]                |
-      |                | [:teammate "Tim Duncan"->"Tony Parker"@0]       |                       | [:teammate "Tony Parker"->"LaMarcus Aldridge"@0] |
-      |                |                                                 |                       | [:serve "Dejounte Murray"->"Spurs"@0]            |
-      |                |                                                 |                       | [:serve "LaMarcus Aldridge"->"Spurs"@0]          |
-      |                |                                                 |                       | [:serve "Marco Belinelli"->"Spurs"@0]            |
-      |                |                                                 |                       | [:serve "Tiago Splitter"->"Spurs"@0]             |
-      |                |                                                 |                       | [:serve "Marco Belinelli"->"Spurs"@1]            |
-      |                |                                                 |                       | [:like "Dejounte Murray"->"Marco Belinelli"@0]   |
+    Then define some list variables:
+      | edge1                                           | vertex2               | edge2                                            |
+      | [:teammate "Manu Ginobili"->"Tim Duncan"@0]     | ("Danny Green")       | [:like "Dejounte Murray"->"Danny Green"@0]       |
+      | [:teammate "Tony Parker"->"Tim Duncan"@0]       | ("Manu Ginobili")     | [:like "Marco Belinelli"->"Danny Green"@0]       |
+      | [:like "Aron Baynes"->"Tim Duncan"@0]           | ("Aron Baynes")       | [:like "Danny Green"->"Marco Belinelli"@0]       |
+      | [:like "Boris Diaw"->"Tim Duncan"@0]            | ("Boris Diaw")        | [:serve "Danny Green"->"Spurs"@0]                |
+      | [:like "Danny Green"->"Tim Duncan"@0]           | ("Shaquile O\'Neal")  | [:teammate "Tony Parker"->"Manu Ginobili"@0]     |
+      | [:like "Dejounte Murray"->"Tim Duncan"@0]       | ("Tony Parker")       | [:like "Dejounte Murray"->"Manu Ginobili"@0]     |
+      | [:like "LaMarcus Aldridge"->"Tim Duncan"@0]     | ("Spurs")             | [:like "Tiago Splitter"->"Manu Ginobili"@0]      |
+      | [:like "Manu Ginobili"->"Tim Duncan"@0]         | ("Dejounte Murray")   | [:like "Tony Parker"->"Manu Ginobili"@0]         |
+      | [:like "Marco Belinelli"->"Tim Duncan"@0]       | ("LaMarcus Aldridge") | [:serve "Manu Ginobili"->"Spurs"@0]              |
+      | [:like "Shaquile O\'Neal"->"Tim Duncan"@0]      | ("Marco Belinelli")   | [:teammate "Manu Ginobili"->"Tony Parker"@0]     |
+      | [:like "Tiago Splitter"->"Tim Duncan"@0]        | ("Tiago Splitter")    | [:serve "Aron Baynes"->"Spurs"@0]                |
+      | [:like "Tony Parker"->"Tim Duncan"@0]           |                       | [:like "Boris Diaw"->"Tony Parker"@0]            |
+      | [:like "Tim Duncan"->"Manu Ginobili"@0]         |                       | [:serve "Boris Diaw"->"Spurs"@0]                 |
+      | [:like "Tim Duncan"->"Tony Parker"@0]           |                       | [:like "Dejounte Murray"->"Tony Parker"@0]       |
+      | [:serve "Tim Duncan"->"Spurs"@0]                |                       | [:like "LaMarcus Aldridge"->"Tony Parker"@0]     |
+      | [:teammate "Tim Duncan"->"Danny Green"@0]       |                       | [:like "Marco Belinelli"->"Tony Parker"@0]       |
+      | [:teammate "Tim Duncan"->"LaMarcus Aldridge"@0] |                       | [:like "Tony Parker"->"LaMarcus Aldridge"@0]     |
+      | [:teammate "Tim Duncan"->"Manu Ginobili"@0]     |                       | [:serve "Tony Parker"->"Spurs"@0]                |
+      | [:teammate "Tim Duncan"->"Tony Parker"@0]       |                       | [:teammate "Tony Parker"->"LaMarcus Aldridge"@0] |
+      |                                                 |                       | [:serve "Dejounte Murray"->"Spurs"@0]            |
+      |                                                 |                       | [:serve "LaMarcus Aldridge"->"Spurs"@0]          |
+      |                                                 |                       | [:serve "Marco Belinelli"->"Spurs"@0]            |
+      |                                                 |                       | [:serve "Tiago Splitter"->"Spurs"@0]             |
+      |                                                 |                       | [:serve "Marco Belinelli"->"Spurs"@1]            |
+      |                                                 |                       | [:like "Dejounte Murray"->"Marco Belinelli"@0]   |
     Then the result should be, in any order, with relax comparison:
-      | _vertices | _edges |
-      | vertex1   | edge1  |
-      | vertex2   | edge2  |
+      | _vertices        | _edges    |
+      | [("Tim Duncan")] | <[edge1]> |
+      | <[vertex2]>      | <[edge2]> |
diff --git a/tests/tck/features/subgraph/subgraph.feature b/tests/tck/features/subgraph/subgraph.feature
index c2ec5ad51846cb83417b8a33fb21718413a66fe3..37b6d50803c0c3cc5ae9685bab16daa81f6f1b9e 100644
--- a/tests/tck/features/subgraph/subgraph.feature
+++ b/tests/tck/features/subgraph/subgraph.feature
@@ -2,10 +2,9 @@
 #
 # This source code is licensed under Apache 2.0 License,
 # attached with Common Clause Condition 1.0, found in the LICENSES directory.
-@skip
 Feature: subgraph
 
-  Background: Prepare space
+  Background:
     Given a graph with space named "nba"
 
   Scenario: invalid input
@@ -101,344 +100,344 @@ Feature: subgraph
       """
       GET SUBGRAPH FROM 'Tim Duncan'
       """
-    Then example
-      | vertex1        | edge1                                           | vertex2               | edge2                                            |
-      | ("Tim Duncan") | [:teammate "Manu Ginobili"->"Tim Duncan"@0]     | ("Danny Green")       | [:teammate "Tony Parker"->"Manu Ginobili"@0]     |
-      |                | [:teammate "Tony Parker"->"Tim Duncan"@0]       | ("Manu Ginobili")     | [:like "Dejounte Murray"->"Manu Ginobili"@0]     |
-      |                | [:like "Aron Baynes"->"Tim Duncan"@0]           | ("Aron Baynes")       | [:like "Tiago Splitter"->"Manu Ginobili"@0]      |
-      |                | [:like "Boris Diaw"->"Tim Duncan"@0]            | ("Boris Diaw")        | [:like "Tony Parker"->"Manu Ginobili"@0]         |
-      |                | [:like "Danny Green"->"Tim Duncan"@0]           | ("Shaquile O\'Neal")  | [:serve "Manu Ginobili"->"Spurs"@0]              |
-      |                | [:like "Dejounte Murray"->"Tim Duncan"@0]       | ("Tony Parker")       | [:teammate "Manu Ginobili"->"Tony Parker"@0]     |
-      |                | [:like "LaMarcus Aldridge"->"Tim Duncan"@0]     | ("Spurs")             | [:serve "Aron Baynes"->"Spurs"@0]                |
-      |                | [:like "Manu Ginobili"->"Tim Duncan"@0]         | ("Dejounte Murray")   | [:like "Boris Diaw"->"Tony Parker"@0]            |
-      |                | [:like "Marco Belinelli"->"Tim Duncan"@0]       | ("LaMarcus Aldridge") | [:serve "Boris Diaw"->"Spurs"@0]                 |
-      |                | [:like "Shaquile O\'Neal"->"Tim Duncan"@0]      | ("Marco Belinelli")   | [:like "Dejounte Murray"->"Tony Parker"@0]       |
-      |                | [:like "Tiago Splitter"->"Tim Duncan"@0]        | ("Tiago Splitter")    | [:like "LaMarcus Aldridge"->"Tony Parker"@0]     |
-      |                | [:like "Tony Parker"->"Tim Duncan"@0]           |                       | [:like "Marco Belinelli"->"Tony Parker"@0]       |
-      |                | [:like "Tim Duncan"->"Manu Ginobili"@0]         |                       | [:like "Tony Parker"->"LaMarcus Aldridge"@0]     |
-      |                | [:like "Tim Duncan"->"Tony Parker"@0]           |                       | [:serve "Tony Parker"->"Spurs"@0]                |
-      |                | [:serve "Tim Duncan"->"Spurs"@0]                |                       | [:teammate "Tony Parker"->"LaMarcus Aldridge"@0] |
-      |                | [:teammate "Tim Duncan"->"Danny Green"@0]       |                       | [:serve "Dejounte Murray"->"Spurs"@0]            |
-      |                | [:teammate "Tim Duncan"->"LaMarcus Aldridge"@0] |                       | [:serve "LaMarcus Aldridge"->"Spurs"@0]          |
-      |                | [:teammate "Tim Duncan"->"Manu Ginobili"@0]     |                       | [:serve "Marco Belinelli"->"Spurs"@0]            |
-      |                | [:teammate "Tim Duncan"->"Tony Parker"@0]       |                       | [:serve "Tiago Splitter"->"Spurs"@0]             |
-      |                |                                                 |                       | [:serve "Marco Belinelli"->"Spurs"@1]            |
-      |                |                                                 |                       | [:like "Dejounte Murray"->"Marco Belinelli"@0]   |
-      |                |                                                 |                       | [:like "Dejounte Murray"->"Danny Green"@0]       |
-      |                |                                                 |                       | [:like "Marco Belinelli"->"Danny Green"@0]       |
-      |                |                                                 |                       | [:like "Danny Green"->"Marco Belinelli"@0]       |
-      |                |                                                 |                       | [:serve "Danny Green"->"Spurs"@0]                |
+    Then define some list variables:
+      | edge1                                           | vertex2               | edge2                                            |
+      | [:teammate "Manu Ginobili"->"Tim Duncan"@0]     | ("Danny Green")       | [:teammate "Tony Parker"->"Manu Ginobili"@0]     |
+      | [:teammate "Tony Parker"->"Tim Duncan"@0]       | ("Manu Ginobili")     | [:like "Dejounte Murray"->"Manu Ginobili"@0]     |
+      | [:like "Aron Baynes"->"Tim Duncan"@0]           | ("Aron Baynes")       | [:like "Tiago Splitter"->"Manu Ginobili"@0]      |
+      | [:like "Boris Diaw"->"Tim Duncan"@0]            | ("Boris Diaw")        | [:like "Tony Parker"->"Manu Ginobili"@0]         |
+      | [:like "Danny Green"->"Tim Duncan"@0]           | ("Shaquile O\'Neal")  | [:serve "Manu Ginobili"->"Spurs"@0]              |
+      | [:like "Dejounte Murray"->"Tim Duncan"@0]       | ("Tony Parker")       | [:teammate "Manu Ginobili"->"Tony Parker"@0]     |
+      | [:like "LaMarcus Aldridge"->"Tim Duncan"@0]     | ("Spurs")             | [:serve "Aron Baynes"->"Spurs"@0]                |
+      | [:like "Manu Ginobili"->"Tim Duncan"@0]         | ("Dejounte Murray")   | [:like "Boris Diaw"->"Tony Parker"@0]            |
+      | [:like "Marco Belinelli"->"Tim Duncan"@0]       | ("LaMarcus Aldridge") | [:serve "Boris Diaw"->"Spurs"@0]                 |
+      | [:like "Shaquile O\'Neal"->"Tim Duncan"@0]      | ("Marco Belinelli")   | [:like "Dejounte Murray"->"Tony Parker"@0]       |
+      | [:like "Tiago Splitter"->"Tim Duncan"@0]        | ("Tiago Splitter")    | [:like "LaMarcus Aldridge"->"Tony Parker"@0]     |
+      | [:like "Tony Parker"->"Tim Duncan"@0]           |                       | [:like "Marco Belinelli"->"Tony Parker"@0]       |
+      | [:like "Tim Duncan"->"Manu Ginobili"@0]         |                       | [:like "Tony Parker"->"LaMarcus Aldridge"@0]     |
+      | [:like "Tim Duncan"->"Tony Parker"@0]           |                       | [:serve "Tony Parker"->"Spurs"@0]                |
+      | [:serve "Tim Duncan"->"Spurs"@0]                |                       | [:teammate "Tony Parker"->"LaMarcus Aldridge"@0] |
+      | [:teammate "Tim Duncan"->"Danny Green"@0]       |                       | [:serve "Dejounte Murray"->"Spurs"@0]            |
+      | [:teammate "Tim Duncan"->"LaMarcus Aldridge"@0] |                       | [:serve "LaMarcus Aldridge"->"Spurs"@0]          |
+      | [:teammate "Tim Duncan"->"Manu Ginobili"@0]     |                       | [:serve "Marco Belinelli"->"Spurs"@0]            |
+      | [:teammate "Tim Duncan"->"Tony Parker"@0]       |                       | [:serve "Tiago Splitter"->"Spurs"@0]             |
+      |                                                 |                       | [:serve "Marco Belinelli"->"Spurs"@1]            |
+      |                                                 |                       | [:like "Dejounte Murray"->"Marco Belinelli"@0]   |
+      |                                                 |                       | [:like "Dejounte Murray"->"Danny Green"@0]       |
+      |                                                 |                       | [:like "Marco Belinelli"->"Danny Green"@0]       |
+      |                                                 |                       | [:like "Danny Green"->"Marco Belinelli"@0]       |
+      |                                                 |                       | [:serve "Danny Green"->"Spurs"@0]                |
     Then the result should be, in any order, with relax comparison:
-      | _vertices | _edges |
-      | vertex1   | edge1  |
-      | vertex2   | edge2  |
+      | _vertices        | _edges    |
+      | [("Tim Duncan")] | <[edge1]> |
+      | <[vertex2]>      | <[edge2]> |
 
   Scenario: two steps
     When executing query:
       """
       GET SUBGRAPH 2 STEPS FROM 'Tim Duncan'
       """
-    Then example
-      | vertex1        | edge1                                           | vertex2               | edge2                                            | vertex3               | edge3                                         |
-      | ("Tim Duncan") | [:teammate "Manu Ginobili"->"Tim Duncan"@0]     | ("Danny Green")       | [:like "Dejounte Murray"->"Danny Green"@0]       | ("Cavaliers")         | [:serve "LeBron James"->"Cavaliers"@0]        |
-      |                | [:teammate "Tony Parker"->"Tim Duncan"@0]       | ("Manu Ginobili")     | [:like "Marco Belinelli"->"Danny Green"@0]       | ("Pistons")           | [:serve "LeBron James"->"Cavaliers"@1]        |
-      |                | [:like "Aron Baynes"->"Tim Duncan"@0]           | ("Aron Baynes")       | [:like "Danny Green"->"LeBron James"@0]          | ("Damian Lillard")    | [:serve "Damian Lillard"->"Trail Blazers"@0]  |
-      |                | [:like "Boris Diaw"->"Tim Duncan"@0]            | ("Boris Diaw")        | [:like "Danny Green"->"Marco Belinelli"@0]       | ("Kings")             | [:serve "Rudy Gay"->"Kings"@0]                |
-      |                | [:like "Danny Green"->"Tim Duncan"@0]           | ("Shaquile O\'Neal")  | [:serve "Danny Green"->"Cavaliers"@0]            | ("Raptors")           | [:serve "Cory Joseph"->"Raptors"@0]           |
-      |                | [:like "Dejounte Murray"->"Tim Duncan"@0]       | ("Tony Parker")       | [:serve "Danny Green"->"Raptors"@0]              | ("Jazz")              | [:serve "Rudy Gay"->"Raptors"@0]              |
-      |                | [:like "LaMarcus Aldridge"->"Tim Duncan"@0]     | ("Spurs")             | [:serve "Danny Green"->"Spurs"@0]                | ("LeBron James")      | [:serve "Tracy McGrady"->"Raptors"@0]         |
-      |                | [:like "Manu Ginobili"->"Tim Duncan"@0]         | ("Dejounte Murray")   | [:teammate "Tony Parker"->"Manu Ginobili"@0]     | ("Paul Gasol")        | [:like "Chris Paul"->"LeBron James"@0]        |
-      |                | [:like "Marco Belinelli"->"Tim Duncan"@0]       | ("LaMarcus Aldridge") | [:like "Dejounte Murray"->"Manu Ginobili"@0]     | ("Kyle Anderson")     | [:serve "LeBron James"->"Heat"@0]             |
-      |                | [:like "Shaquile O\'Neal"->"Tim Duncan"@0]      | ("Marco Belinelli")   | [:like "Tiago Splitter"->"Manu Ginobili"@0]      | ("Rudy Gay")          | [:serve "LeBron James"->"Lakers"@0]           |
-      |                | [:like "Tiago Splitter"->"Tim Duncan"@0]        | ("Tiago Splitter")    | [:like "Tony Parker"->"Manu Ginobili"@0]         | ("Kevin Durant")      | [:serve "Paul Gasol"->"Bulls"@0]              |
-      |                | [:like "Tony Parker"->"Tim Duncan"@0]           |                       | [:serve "Manu Ginobili"->"Spurs"@0]              | ("Yao Ming")          | [:serve "Paul Gasol"->"Lakers"@0]             |
-      |                | [:like "Tim Duncan"->"Manu Ginobili"@0]         |                       | [:teammate "Manu Ginobili"->"Tony Parker"@0]     | ("James Harden")      | [:like "Tracy McGrady"->"Rudy Gay"@0]         |
-      |                | [:like "Tim Duncan"->"Tony Parker"@0]           |                       | [:serve "Aron Baynes"->"Celtics"@0]              | ("Hornets")           | [:serve "Kevin Durant"->"Warriors"@0]         |
-      |                | [:serve "Tim Duncan"->"Spurs"@0]                |                       | [:serve "Aron Baynes"->"Pistons"@0]              | ("David West")        | [:like "Yao Ming"->"Tracy McGrady"@0]         |
-      |                | [:teammate "Tim Duncan"->"Danny Green"@0]       |                       | [:serve "Aron Baynes"->"Spurs"@0]                | ("Chris Paul")        | [:like "Russell Westbrook"->"James Harden"@0] |
-      |                | [:teammate "Tim Duncan"->"LaMarcus Aldridge"@0] |                       | [:like "Boris Diaw"->"Tony Parker"@0]            | ("Celtics")           | [:like "James Harden"->"Russell Westbrook"@0] |
-      |                | [:teammate "Tim Duncan"->"Manu Ginobili"@0]     |                       | [:serve "Boris Diaw"->"Hawks"@0]                 | ("Jonathon Simmons")  | [:serve "Chris Paul"->"Hornets"@0]            |
-      |                | [:teammate "Tim Duncan"->"Tony Parker"@0]       |                       | [:serve "Boris Diaw"->"Hornets"@0]               | ("Hawks")             | [:serve "David West"->"Hornets"@0]            |
-      |                |                                                 |                       | [:serve "Boris Diaw"->"Jazz"@0]                  | ("Heat")              | [:serve "David West"->"Warriors"@0]           |
-      |                |                                                 |                       | [:serve "Boris Diaw"->"Spurs"@0]                 | ("Lakers")            | [:serve "Jonathon Simmons"->"76ers"@0]        |
-      |                |                                                 |                       | [:serve "Boris Diaw"->"Suns"@0]                  | ("Suns")              | [:serve "Jonathon Simmons"->"Magic"@0]        |
-      |                |                                                 |                       | [:like "Yao Ming"->"Shaquile O\'Neal"@0]         | ("Magic")             | [:serve "JaVale McGee"->"Lakers"@0]           |
-      |                |                                                 |                       | [:like "Shaquile O\'Neal"->"JaVale McGee"@0]     | ("Trail Blazers")     | [:serve "Tracy McGrady"->"Magic"@0]           |
-      |                |                                                 |                       | [:serve "Shaquile O\'Neal"->"Cavaliers"@0]       | ("76ers")             | [:serve "JaVale McGee"->"Warriors"@0]         |
-      |                |                                                 |                       | [:serve "Shaquile O\'Neal"->"Celtics"@0]         | ("JaVale McGee")      |                                               |
-      |                |                                                 |                       | [:serve "Shaquile O\'Neal"->"Heat"@0]            | ("Cory Joseph")       |                                               |
-      |                |                                                 |                       | [:serve "Shaquile O\'Neal"->"Lakers"@0]          | ("Tracy McGrady")     |                                               |
-      |                |                                                 |                       | [:serve "Shaquile O\'Neal"->"Magic"@0]           | ("Russell Westbrook") |                                               |
-      |                |                                                 |                       | [:serve "Shaquile O\'Neal"->"Suns"@0]            | ("Bulls")             |                                               |
-      |                |                                                 |                       | [:like "Dejounte Murray"->"Tony Parker"@0]       | ("Warriors")          |                                               |
-      |                |                                                 |                       | [:like "LaMarcus Aldridge"->"Tony Parker"@0]     |                       |                                               |
-      |                |                                                 |                       | [:like "Marco Belinelli"->"Tony Parker"@0]       |                       |                                               |
-      |                |                                                 |                       | [:like "Tony Parker"->"LaMarcus Aldridge"@0]     |                       |                                               |
-      |                |                                                 |                       | [:serve "Tony Parker"->"Hornets"@0]              |                       |                                               |
-      |                |                                                 |                       | [:serve "Tony Parker"->"Spurs"@0]                |                       |                                               |
-      |                |                                                 |                       | [:teammate "Tony Parker"->"Kyle Anderson"@0]     |                       |                                               |
-      |                |                                                 |                       | [:teammate "Tony Parker"->"LaMarcus Aldridge"@0] |                       |                                               |
-      |                |                                                 |                       | [:serve "Cory Joseph"->"Spurs"@0]                |                       |                                               |
-      |                |                                                 |                       | [:serve "David West"->"Spurs"@0]                 |                       |                                               |
-      |                |                                                 |                       | [:serve "Dejounte Murray"->"Spurs"@0]            |                       |                                               |
-      |                |                                                 |                       | [:serve "Jonathon Simmons"->"Spurs"@0]           |                       |                                               |
-      |                |                                                 |                       | [:serve "Kyle Anderson"->"Spurs"@0]              |                       |                                               |
-      |                |                                                 |                       | [:serve "LaMarcus Aldridge"->"Spurs"@0]          |                       |                                               |
-      |                |                                                 |                       | [:serve "Marco Belinelli"->"Spurs"@0]            |                       |                                               |
-      |                |                                                 |                       | [:serve "Paul Gasol"->"Spurs"@0]                 |                       |                                               |
-      |                |                                                 |                       | [:serve "Rudy Gay"->"Spurs"@0]                   |                       |                                               |
-      |                |                                                 |                       | [:serve "Tiago Splitter"->"Spurs"@0]             |                       |                                               |
-      |                |                                                 |                       | [:serve "Tracy McGrady"->"Spurs"@0]              |                       |                                               |
-      |                |                                                 |                       | [:serve "Marco Belinelli"->"Spurs"@1]            |                       |                                               |
-      |                |                                                 |                       | [:like "Dejounte Murray"->"Chris Paul"@0]        |                       |                                               |
-      |                |                                                 |                       | [:like "Dejounte Murray"->"James Harden"@0]      |                       |                                               |
-      |                |                                                 |                       | [:like "Dejounte Murray"->"Kevin Durant"@0]      |                       |                                               |
-      |                |                                                 |                       | [:like "Dejounte Murray"->"Kyle Anderson"@0]     |                       |                                               |
-      |                |                                                 |                       | [:like "Dejounte Murray"->"LeBron James"@0]      |                       |                                               |
-      |                |                                                 |                       | [:like "Dejounte Murray"->"Marco Belinelli"@0]   |                       |                                               |
-      |                |                                                 |                       | [:like "Dejounte Murray"->"Russell Westbrook"@0] |                       |                                               |
-      |                |                                                 |                       | [:like "Damian Lillard"->"LaMarcus Aldridge"@0]  |                       |                                               |
-      |                |                                                 |                       | [:like "Rudy Gay"->"LaMarcus Aldridge"@0]        |                       |                                               |
-      |                |                                                 |                       | [:serve "LaMarcus Aldridge"->"Trail Blazers"@0]  |                       |                                               |
-      |                |                                                 |                       | [:serve "Marco Belinelli"->"76ers"@0]            |                       |                                               |
-      |                |                                                 |                       | [:serve "Marco Belinelli"->"Bulls"@0]            |                       |                                               |
-      |                |                                                 |                       | [:serve "Marco Belinelli"->"Hawks"@0]            |                       |                                               |
-      |                |                                                 |                       | [:serve "Marco Belinelli"->"Hornets"@0]          |                       |                                               |
-      |                |                                                 |                       | [:serve "Marco Belinelli"->"Kings"@0]            |                       |                                               |
-      |                |                                                 |                       | [:serve "Marco Belinelli"->"Raptors"@0]          |                       |                                               |
-      |                |                                                 |                       | [:serve "Marco Belinelli"->"Warriors"@0]         |                       |                                               |
-      |                |                                                 |                       | [:serve "Marco Belinelli"->"Hornets"@1]          |                       |                                               |
-      |                |                                                 |                       | [:serve "Tiago Splitter"->"76ers"@0]             |                       |                                               |
-      |                |                                                 |                       | [:serve "Tiago Splitter"->"Hawks"@0]             |                       |                                               |
+    Then define some list variables:
+      | edge1                                           | vertex2               | edge2                                            | vertex3               | edge3                                         |
+      | [:teammate "Manu Ginobili"->"Tim Duncan"@0]     | ("Danny Green")       | [:like "Dejounte Murray"->"Danny Green"@0]       | ("Cavaliers")         | [:serve "LeBron James"->"Cavaliers"@0]        |
+      | [:teammate "Tony Parker"->"Tim Duncan"@0]       | ("Manu Ginobili")     | [:like "Marco Belinelli"->"Danny Green"@0]       | ("Pistons")           | [:serve "LeBron James"->"Cavaliers"@1]        |
+      | [:like "Aron Baynes"->"Tim Duncan"@0]           | ("Aron Baynes")       | [:like "Danny Green"->"LeBron James"@0]          | ("Damian Lillard")    | [:serve "Damian Lillard"->"Trail Blazers"@0]  |
+      | [:like "Boris Diaw"->"Tim Duncan"@0]            | ("Boris Diaw")        | [:like "Danny Green"->"Marco Belinelli"@0]       | ("Kings")             | [:serve "Rudy Gay"->"Kings"@0]                |
+      | [:like "Danny Green"->"Tim Duncan"@0]           | ("Shaquile O\'Neal")  | [:serve "Danny Green"->"Cavaliers"@0]            | ("Raptors")           | [:serve "Cory Joseph"->"Raptors"@0]           |
+      | [:like "Dejounte Murray"->"Tim Duncan"@0]       | ("Tony Parker")       | [:serve "Danny Green"->"Raptors"@0]              | ("Jazz")              | [:serve "Rudy Gay"->"Raptors"@0]              |
+      | [:like "LaMarcus Aldridge"->"Tim Duncan"@0]     | ("Spurs")             | [:serve "Danny Green"->"Spurs"@0]                | ("LeBron James")      | [:serve "Tracy McGrady"->"Raptors"@0]         |
+      | [:like "Manu Ginobili"->"Tim Duncan"@0]         | ("Dejounte Murray")   | [:teammate "Tony Parker"->"Manu Ginobili"@0]     | ("Paul Gasol")        | [:like "Chris Paul"->"LeBron James"@0]        |
+      | [:like "Marco Belinelli"->"Tim Duncan"@0]       | ("LaMarcus Aldridge") | [:like "Dejounte Murray"->"Manu Ginobili"@0]     | ("Kyle Anderson")     | [:serve "LeBron James"->"Heat"@0]             |
+      | [:like "Shaquile O\'Neal"->"Tim Duncan"@0]      | ("Marco Belinelli")   | [:like "Tiago Splitter"->"Manu Ginobili"@0]      | ("Rudy Gay")          | [:serve "LeBron James"->"Lakers"@0]           |
+      | [:like "Tiago Splitter"->"Tim Duncan"@0]        | ("Tiago Splitter")    | [:like "Tony Parker"->"Manu Ginobili"@0]         | ("Kevin Durant")      | [:serve "Paul Gasol"->"Bulls"@0]              |
+      | [:like "Tony Parker"->"Tim Duncan"@0]           |                       | [:serve "Manu Ginobili"->"Spurs"@0]              | ("Yao Ming")          | [:serve "Paul Gasol"->"Lakers"@0]             |
+      | [:like "Tim Duncan"->"Manu Ginobili"@0]         |                       | [:teammate "Manu Ginobili"->"Tony Parker"@0]     | ("James Harden")      | [:like "Tracy McGrady"->"Rudy Gay"@0]         |
+      | [:like "Tim Duncan"->"Tony Parker"@0]           |                       | [:serve "Aron Baynes"->"Celtics"@0]              | ("Hornets")           | [:serve "Kevin Durant"->"Warriors"@0]         |
+      | [:serve "Tim Duncan"->"Spurs"@0]                |                       | [:serve "Aron Baynes"->"Pistons"@0]              | ("David West")        | [:like "Yao Ming"->"Tracy McGrady"@0]         |
+      | [:teammate "Tim Duncan"->"Danny Green"@0]       |                       | [:serve "Aron Baynes"->"Spurs"@0]                | ("Chris Paul")        | [:like "Russell Westbrook"->"James Harden"@0] |
+      | [:teammate "Tim Duncan"->"LaMarcus Aldridge"@0] |                       | [:like "Boris Diaw"->"Tony Parker"@0]            | ("Celtics")           | [:like "James Harden"->"Russell Westbrook"@0] |
+      | [:teammate "Tim Duncan"->"Manu Ginobili"@0]     |                       | [:serve "Boris Diaw"->"Hawks"@0]                 | ("Jonathon Simmons")  | [:serve "Chris Paul"->"Hornets"@0]            |
+      | [:teammate "Tim Duncan"->"Tony Parker"@0]       |                       | [:serve "Boris Diaw"->"Hornets"@0]               | ("Hawks")             | [:serve "David West"->"Hornets"@0]            |
+      |                                                 |                       | [:serve "Boris Diaw"->"Jazz"@0]                  | ("Heat")              | [:serve "David West"->"Warriors"@0]           |
+      |                                                 |                       | [:serve "Boris Diaw"->"Spurs"@0]                 | ("Lakers")            | [:serve "Jonathon Simmons"->"76ers"@0]        |
+      |                                                 |                       | [:serve "Boris Diaw"->"Suns"@0]                  | ("Suns")              | [:serve "Jonathon Simmons"->"Magic"@0]        |
+      |                                                 |                       | [:like "Yao Ming"->"Shaquile O\'Neal"@0]         | ("Magic")             | [:serve "JaVale McGee"->"Lakers"@0]           |
+      |                                                 |                       | [:like "Shaquile O\'Neal"->"JaVale McGee"@0]     | ("Trail Blazers")     | [:serve "Tracy McGrady"->"Magic"@0]           |
+      |                                                 |                       | [:serve "Shaquile O\'Neal"->"Cavaliers"@0]       | ("76ers")             | [:serve "JaVale McGee"->"Warriors"@0]         |
+      |                                                 |                       | [:serve "Shaquile O\'Neal"->"Celtics"@0]         | ("JaVale McGee")      |                                               |
+      |                                                 |                       | [:serve "Shaquile O\'Neal"->"Heat"@0]            | ("Cory Joseph")       |                                               |
+      |                                                 |                       | [:serve "Shaquile O\'Neal"->"Lakers"@0]          | ("Tracy McGrady")     |                                               |
+      |                                                 |                       | [:serve "Shaquile O\'Neal"->"Magic"@0]           | ("Russell Westbrook") |                                               |
+      |                                                 |                       | [:serve "Shaquile O\'Neal"->"Suns"@0]            | ("Bulls")             |                                               |
+      |                                                 |                       | [:like "Dejounte Murray"->"Tony Parker"@0]       | ("Warriors")          |                                               |
+      |                                                 |                       | [:like "LaMarcus Aldridge"->"Tony Parker"@0]     |                       |                                               |
+      |                                                 |                       | [:like "Marco Belinelli"->"Tony Parker"@0]       |                       |                                               |
+      |                                                 |                       | [:like "Tony Parker"->"LaMarcus Aldridge"@0]     |                       |                                               |
+      |                                                 |                       | [:serve "Tony Parker"->"Hornets"@0]              |                       |                                               |
+      |                                                 |                       | [:serve "Tony Parker"->"Spurs"@0]                |                       |                                               |
+      |                                                 |                       | [:teammate "Tony Parker"->"Kyle Anderson"@0]     |                       |                                               |
+      |                                                 |                       | [:teammate "Tony Parker"->"LaMarcus Aldridge"@0] |                       |                                               |
+      |                                                 |                       | [:serve "Cory Joseph"->"Spurs"@0]                |                       |                                               |
+      |                                                 |                       | [:serve "David West"->"Spurs"@0]                 |                       |                                               |
+      |                                                 |                       | [:serve "Dejounte Murray"->"Spurs"@0]            |                       |                                               |
+      |                                                 |                       | [:serve "Jonathon Simmons"->"Spurs"@0]           |                       |                                               |
+      |                                                 |                       | [:serve "Kyle Anderson"->"Spurs"@0]              |                       |                                               |
+      |                                                 |                       | [:serve "LaMarcus Aldridge"->"Spurs"@0]          |                       |                                               |
+      |                                                 |                       | [:serve "Marco Belinelli"->"Spurs"@0]            |                       |                                               |
+      |                                                 |                       | [:serve "Paul Gasol"->"Spurs"@0]                 |                       |                                               |
+      |                                                 |                       | [:serve "Rudy Gay"->"Spurs"@0]                   |                       |                                               |
+      |                                                 |                       | [:serve "Tiago Splitter"->"Spurs"@0]             |                       |                                               |
+      |                                                 |                       | [:serve "Tracy McGrady"->"Spurs"@0]              |                       |                                               |
+      |                                                 |                       | [:serve "Marco Belinelli"->"Spurs"@1]            |                       |                                               |
+      |                                                 |                       | [:like "Dejounte Murray"->"Chris Paul"@0]        |                       |                                               |
+      |                                                 |                       | [:like "Dejounte Murray"->"James Harden"@0]      |                       |                                               |
+      |                                                 |                       | [:like "Dejounte Murray"->"Kevin Durant"@0]      |                       |                                               |
+      |                                                 |                       | [:like "Dejounte Murray"->"Kyle Anderson"@0]     |                       |                                               |
+      |                                                 |                       | [:like "Dejounte Murray"->"LeBron James"@0]      |                       |                                               |
+      |                                                 |                       | [:like "Dejounte Murray"->"Marco Belinelli"@0]   |                       |                                               |
+      |                                                 |                       | [:like "Dejounte Murray"->"Russell Westbrook"@0] |                       |                                               |
+      |                                                 |                       | [:like "Damian Lillard"->"LaMarcus Aldridge"@0]  |                       |                                               |
+      |                                                 |                       | [:like "Rudy Gay"->"LaMarcus Aldridge"@0]        |                       |                                               |
+      |                                                 |                       | [:serve "LaMarcus Aldridge"->"Trail Blazers"@0]  |                       |                                               |
+      |                                                 |                       | [:serve "Marco Belinelli"->"76ers"@0]            |                       |                                               |
+      |                                                 |                       | [:serve "Marco Belinelli"->"Bulls"@0]            |                       |                                               |
+      |                                                 |                       | [:serve "Marco Belinelli"->"Hawks"@0]            |                       |                                               |
+      |                                                 |                       | [:serve "Marco Belinelli"->"Hornets"@0]          |                       |                                               |
+      |                                                 |                       | [:serve "Marco Belinelli"->"Kings"@0]            |                       |                                               |
+      |                                                 |                       | [:serve "Marco Belinelli"->"Raptors"@0]          |                       |                                               |
+      |                                                 |                       | [:serve "Marco Belinelli"->"Warriors"@0]         |                       |                                               |
+      |                                                 |                       | [:serve "Marco Belinelli"->"Hornets"@1]          |                       |                                               |
+      |                                                 |                       | [:serve "Tiago Splitter"->"76ers"@0]             |                       |                                               |
+      |                                                 |                       | [:serve "Tiago Splitter"->"Hawks"@0]             |                       |                                               |
     Then the result should be, in any order, with relax comparison:
-      | _vertices | _edges |
-      | vertex1   | edge1  |
-      | vertex2   | edge2  |
-      | vertex3   | edge3  |
+      | _vertices        | _edges    |
+      | [("Tim Duncan")] | <[edge1]> |
+      | <[vertex2]>      | <[edge2]> |
+      | <[vertex3]>      | <[edge3]> |
 
   Scenario: in edge
     When executing query:
       """
       GET SUBGRAPH 2 STEPS FROM 'Tim Duncan' IN like, serve
       """
-    Then example
-      | vertex1        | edge1                                       | vertex2               | edge2                                           | vertex3             | edge3                                            |
-      | ("Tim Duncan") | [:like "Aron Baynes"->"Tim Duncan"@0]       | ("Manu Ginobili")     | [:like "Dejounte Murray"->"Manu Ginobili"@0]    | ("Damian Lillard")  | [:teammate "Manu Ginobili"->"Tim Duncan"@0]      |
-      |                | [:like "Boris Diaw"->"Tim Duncan"@0]        | ("Shaquile O\'Neal")  | [:like "Tiago Splitter"->"Manu Ginobili"@0]     | ("Rudy Gay")        | [:teammate "Tony Parker"->"Tim Duncan"@0]        |
-      |                | [:like "Danny Green"->"Tim Duncan"@0]       | ("LaMarcus Aldridge") | [:like "Tim Duncan"->"Manu Ginobili"@0]         | ("Dejounte Murray") | [:teammate "Tim Duncan"->"Danny Green"@0]        |
-      |                | [:like "Dejounte Murray"->"Tim Duncan"@0]   | ("Marco Belinelli")   | [:like "Tony Parker"->"Manu Ginobili"@0]        | ("Yao Ming")        | [:teammate "Tim Duncan"->"LaMarcus Aldridge"@0]  |
-      |                | [:like "LaMarcus Aldridge"->"Tim Duncan"@0] | ("Danny Green")       | [:like "Yao Ming"->"Shaquile O\'Neal"@0]        | ("Tiago Splitter")  | [:teammate "Tim Duncan"->"Manu Ginobili"@0]      |
-      |                | [:like "Manu Ginobili"->"Tim Duncan"@0]     | ("Tony Parker")       | [:like "Damian Lillard"->"LaMarcus Aldridge"@0] | ("Boris Diaw")      | [:teammate "Tim Duncan"->"Tony Parker"@0]        |
-      |                | [:like "Marco Belinelli"->"Tim Duncan"@0]   |                       | [:like "Rudy Gay"->"LaMarcus Aldridge"@0]       |                     | [:teammate "Manu Ginobili"->"Tony Parker"@0]     |
-      |                | [:like "Shaquile O\'Neal"->"Tim Duncan"@0]  |                       | [:like "Tony Parker"->"LaMarcus Aldridge"@0]    |                     | [:teammate "Tony Parker"->"LaMarcus Aldridge"@0] |
-      |                | [:like "Tiago Splitter"->"Tim Duncan"@0]    |                       | [:like "Danny Green"->"Marco Belinelli"@0]      |                     | [:teammate "Tony Parker"->"Manu Ginobili"@0]     |
-      |                | [:like "Tony Parker"->"Tim Duncan"@0]       |                       | [:like "Dejounte Murray"->"Marco Belinelli"@0]  |                     |                                                  |
-      |                |                                             |                       | [:like "Dejounte Murray"->"Danny Green"@0]      |                     |                                                  |
-      |                |                                             |                       | [:like "Marco Belinelli"->"Danny Green"@0]      |                     |                                                  |
-      |                |                                             |                       | [:like "Boris Diaw"->"Tony Parker"@0]           |                     |                                                  |
-      |                |                                             |                       | [:like "Dejounte Murray"->"Tony Parker"@0]      |                     |                                                  |
-      |                |                                             |                       | [:like "LaMarcus Aldridge"->"Tony Parker"@0]    |                     |                                                  |
-      |                |                                             |                       | [:like "Marco Belinelli"->"Tony Parker"@0]      |                     |                                                  |
-      |                |                                             |                       | [:like "Tim Duncan"->"Tony Parker"@0]           |                     |                                                  |
+    Then define some list variables:
+      | edge1                                       | vertex2               | edge2                                           | vertex3             | edge3                                            |
+      | [:like "Aron Baynes"->"Tim Duncan"@0]       | ("Manu Ginobili")     | [:like "Dejounte Murray"->"Manu Ginobili"@0]    | ("Damian Lillard")  | [:teammate "Manu Ginobili"->"Tim Duncan"@0]      |
+      | [:like "Boris Diaw"->"Tim Duncan"@0]        | ("Shaquile O\'Neal")  | [:like "Tiago Splitter"->"Manu Ginobili"@0]     | ("Rudy Gay")        | [:teammate "Tony Parker"->"Tim Duncan"@0]        |
+      | [:like "Danny Green"->"Tim Duncan"@0]       | ("LaMarcus Aldridge") | [:like "Tim Duncan"->"Manu Ginobili"@0]         | ("Dejounte Murray") | [:teammate "Tim Duncan"->"Danny Green"@0]        |
+      | [:like "Dejounte Murray"->"Tim Duncan"@0]   | ("Marco Belinelli")   | [:like "Tony Parker"->"Manu Ginobili"@0]        | ("Yao Ming")        | [:teammate "Tim Duncan"->"LaMarcus Aldridge"@0]  |
+      | [:like "LaMarcus Aldridge"->"Tim Duncan"@0] | ("Danny Green")       | [:like "Yao Ming"->"Shaquile O\'Neal"@0]        | ("Tiago Splitter")  | [:teammate "Tim Duncan"->"Manu Ginobili"@0]      |
+      | [:like "Manu Ginobili"->"Tim Duncan"@0]     | ("Tony Parker")       | [:like "Damian Lillard"->"LaMarcus Aldridge"@0] | ("Boris Diaw")      | [:teammate "Tim Duncan"->"Tony Parker"@0]        |
+      | [:like "Marco Belinelli"->"Tim Duncan"@0]   |                       | [:like "Rudy Gay"->"LaMarcus Aldridge"@0]       |                     | [:teammate "Manu Ginobili"->"Tony Parker"@0]     |
+      | [:like "Shaquile O\'Neal"->"Tim Duncan"@0]  |                       | [:like "Tony Parker"->"LaMarcus Aldridge"@0]    |                     | [:teammate "Tony Parker"->"LaMarcus Aldridge"@0] |
+      | [:like "Tiago Splitter"->"Tim Duncan"@0]    |                       | [:like "Danny Green"->"Marco Belinelli"@0]      |                     | [:teammate "Tony Parker"->"Manu Ginobili"@0]     |
+      | [:like "Tony Parker"->"Tim Duncan"@0]       |                       | [:like "Dejounte Murray"->"Marco Belinelli"@0]  |                     |                                                  |
+      |                                             |                       | [:like "Dejounte Murray"->"Danny Green"@0]      |                     |                                                  |
+      |                                             |                       | [:like "Marco Belinelli"->"Danny Green"@0]      |                     |                                                  |
+      |                                             |                       | [:like "Boris Diaw"->"Tony Parker"@0]           |                     |                                                  |
+      |                                             |                       | [:like "Dejounte Murray"->"Tony Parker"@0]      |                     |                                                  |
+      |                                             |                       | [:like "LaMarcus Aldridge"->"Tony Parker"@0]    |                     |                                                  |
+      |                                             |                       | [:like "Marco Belinelli"->"Tony Parker"@0]      |                     |                                                  |
+      |                                             |                       | [:like "Tim Duncan"->"Tony Parker"@0]           |                     |                                                  |
     Then the result should be, in any order, with relax comparison:
-      | _vertices | _edges |
-      | vertex1   | edge1  |
-      | vertex2   | edge2  |
-      | vertex3   | edge3  |
+      | _vertices        | _edges    |
+      | [("Tim Duncan")] | <[edge1]> |
+      | <[vertex2]>      | <[edge2]> |
+      | <[vertex3]>      | <[edge3]> |
 
   Scenario: in and out edge
     When executing query:
       """
       GET SUBGRAPH 2 STEPS FROM 'Tim Duncan' IN like OUT serve
       """
-    Then example
-      | vertex1        | edge1                                       | vertex2               | edge2                                           | vertex3            | edge3                                            |
-      | ("Tim Duncan") | [:serve "Tim Duncan"->"Spurs"@0]            | ("Manu Ginobili")     | [:serve "Manu Ginobili"->"Spurs"@0]             | ("Raptors")        | [:serve "Rudy Gay"->"Raptors"@0]                 |
-      |                | [:like "Aron Baynes"->"Tim Duncan"@0]       | ("Danny Green")       | [:like "Dejounte Murray"->"Manu Ginobili"@0]    | ("Jazz")           | [:serve "Damian Lillard"->"Trail Blazers"@0]     |
-      |                | [:like "Boris Diaw"->"Tim Duncan"@0]        | ("Tony Parker")       | [:like "Tiago Splitter"->"Manu Ginobili"@0]     | ("Cavaliers")      | [:serve "Rudy Gay"->"Kings"@0]                   |
-      |                | [:like "Danny Green"->"Tim Duncan"@0]       | ("Aron Baynes")       | [:like "Tim Duncan"->"Manu Ginobili"@0]         | ("Pistons")        | [:serve "Rudy Gay"->"Spurs"@0]                   |
-      |                | [:like "Dejounte Murray"->"Tim Duncan"@0]   | ("Boris Diaw")        | [:like "Tony Parker"->"Manu Ginobili"@0]        | ("Damian Lillard") | [:teammate "Manu Ginobili"->"Tim Duncan"@0]      |
-      |                | [:like "LaMarcus Aldridge"->"Tim Duncan"@0] | ("Shaquile O\'Neal")  | [:serve "Danny Green"->"Cavaliers"@0]           | ("Kings")          | [:teammate "Tony Parker"->"Tim Duncan"@0]        |
-      |                | [:like "Manu Ginobili"->"Tim Duncan"@0]     | ("Dejounte Murray")   | [:serve "Danny Green"->"Raptors"@0]             | ("Hornets")        | [:teammate "Tim Duncan"->"Danny Green"@0]        |
-      |                | [:like "Marco Belinelli"->"Tim Duncan"@0]   | ("LaMarcus Aldridge") | [:serve "Danny Green"->"Spurs"@0]               | ("Spurs")          | [:teammate "Tim Duncan"->"LaMarcus Aldridge"@0]  |
-      |                | [:like "Shaquile O\'Neal"->"Tim Duncan"@0]  | ("Marco Belinelli")   | [:like "Dejounte Murray"->"Danny Green"@0]      | ("Rudy Gay")       | [:teammate "Tim Duncan"->"Manu Ginobili"@0]      |
-      |                | [:like "Tiago Splitter"->"Tim Duncan"@0]    | ("Tiago Splitter")    | [:like "Marco Belinelli"->"Danny Green"@0]      | ("Yao Ming")       | [:teammate "Tim Duncan"->"Tony Parker"@0]        |
-      |                | [:like "Tony Parker"->"Tim Duncan"@0]       |                       | [:serve "Tony Parker"->"Hornets"@0]             | ("Hawks")          | [:teammate "Manu Ginobili"->"Tony Parker"@0]     |
-      |                |                                             |                       | [:serve "Tony Parker"->"Spurs"@0]               | ("Heat")           | [:teammate "Tony Parker"->"LaMarcus Aldridge"@0] |
-      |                |                                             |                       | [:like "Boris Diaw"->"Tony Parker"@0]           | ("Lakers")         | [:teammate "Tony Parker"->"Manu Ginobili"@0]     |
-      |                |                                             |                       | [:like "Dejounte Murray"->"Tony Parker"@0]      | ("Celtics")        |                                                  |
-      |                |                                             |                       | [:like "LaMarcus Aldridge"->"Tony Parker"@0]    | ("Suns")           |                                                  |
-      |                |                                             |                       | [:like "Marco Belinelli"->"Tony Parker"@0]      | ("Magic")          |                                                  |
-      |                |                                             |                       | [:like "Tim Duncan"->"Tony Parker"@0]           | ("Trail Blazers")  |                                                  |
-      |                |                                             |                       | [:serve "Aron Baynes"->"Celtics"@0]             | ("76ers")          |                                                  |
-      |                |                                             |                       | [:serve "Aron Baynes"->"Pistons"@0]             | ("Bulls")          |                                                  |
-      |                |                                             |                       | [:serve "Aron Baynes"->"Spurs"@0]               | ("Warriors")       |                                                  |
-      |                |                                             |                       | [:serve "Boris Diaw"->"Hawks"@0]                |                    |                                                  |
-      |                |                                             |                       | [:serve "Boris Diaw"->"Hornets"@0]              |                    |                                                  |
-      |                |                                             |                       | [:serve "Boris Diaw"->"Jazz"@0]                 |                    |                                                  |
-      |                |                                             |                       | [:serve "Boris Diaw"->"Spurs"@0]                |                    |                                                  |
-      |                |                                             |                       | [:serve "Boris Diaw"->"Suns"@0]                 |                    |                                                  |
-      |                |                                             |                       | [:serve "Shaquile O\'Neal"->"Cavaliers"@0]      |                    |                                                  |
-      |                |                                             |                       | [:serve "Shaquile O\'Neal"->"Celtics"@0]        |                    |                                                  |
-      |                |                                             |                       | [:serve "Shaquile O\'Neal"->"Heat"@0]           |                    |                                                  |
-      |                |                                             |                       | [:serve "Shaquile O\'Neal"->"Lakers"@0]         |                    |                                                  |
-      |                |                                             |                       | [:serve "Shaquile O\'Neal"->"Magic"@0]          |                    |                                                  |
-      |                |                                             |                       | [:serve "Shaquile O\'Neal"->"Suns"@0]           |                    |                                                  |
-      |                |                                             |                       | [:like "Yao Ming"->"Shaquile O\'Neal"@0]        |                    |                                                  |
-      |                |                                             |                       | [:serve "Dejounte Murray"->"Spurs"@0]           |                    |                                                  |
-      |                |                                             |                       | [:serve "LaMarcus Aldridge"->"Spurs"@0]         |                    |                                                  |
-      |                |                                             |                       | [:serve "LaMarcus Aldridge"->"Trail Blazers"@0] |                    |                                                  |
-      |                |                                             |                       | [:like "Damian Lillard"->"LaMarcus Aldridge"@0] |                    |                                                  |
-      |                |                                             |                       | [:like "Rudy Gay"->"LaMarcus Aldridge"@0]       |                    |                                                  |
-      |                |                                             |                       | [:like "Tony Parker"->"LaMarcus Aldridge"@0]    |                    |                                                  |
-      |                |                                             |                       | [:serve "Marco Belinelli"->"76ers"@0]           |                    |                                                  |
-      |                |                                             |                       | [:serve "Marco Belinelli"->"Bulls"@0]           |                    |                                                  |
-      |                |                                             |                       | [:serve "Marco Belinelli"->"Hawks"@0]           |                    |                                                  |
-      |                |                                             |                       | [:serve "Marco Belinelli"->"Hornets"@0]         |                    |                                                  |
-      |                |                                             |                       | [:serve "Marco Belinelli"->"Kings"@0]           |                    |                                                  |
-      |                |                                             |                       | [:serve "Marco Belinelli"->"Raptors"@0]         |                    |                                                  |
-      |                |                                             |                       | [:serve "Marco Belinelli"->"Spurs"@0]           |                    |                                                  |
-      |                |                                             |                       | [:serve "Marco Belinelli"->"Warriors"@0]        |                    |                                                  |
-      |                |                                             |                       | [:serve "Marco Belinelli"->"Hornets"@1]         |                    |                                                  |
-      |                |                                             |                       | [:serve "Marco Belinelli"->"Spurs"@1]           |                    |                                                  |
-      |                |                                             |                       | [:like "Danny Green"->"Marco Belinelli"@0]      |                    |                                                  |
-      |                |                                             |                       | [:like "Dejounte Murray"->"Marco Belinelli"@0]  |                    |                                                  |
-      |                |                                             |                       | [:serve "Tiago Splitter"->"76ers"@0]            |                    |                                                  |
-      |                |                                             |                       | [:serve "Tiago Splitter"->"Hawks"@0]            |                    |                                                  |
-      |                |                                             |                       | [:serve "Tiago Splitter"->"Spurs"@0]            |                    |                                                  |
+    Then define some list variables:
+      | edge1                                       | vertex2               | edge2                                           | vertex3            | edge3                                            |
+      | [:serve "Tim Duncan"->"Spurs"@0]            | ("Manu Ginobili")     | [:serve "Manu Ginobili"->"Spurs"@0]             | ("Raptors")        | [:serve "Rudy Gay"->"Raptors"@0]                 |
+      | [:like "Aron Baynes"->"Tim Duncan"@0]       | ("Danny Green")       | [:like "Dejounte Murray"->"Manu Ginobili"@0]    | ("Jazz")           | [:serve "Damian Lillard"->"Trail Blazers"@0]     |
+      | [:like "Boris Diaw"->"Tim Duncan"@0]        | ("Tony Parker")       | [:like "Tiago Splitter"->"Manu Ginobili"@0]     | ("Cavaliers")      | [:serve "Rudy Gay"->"Kings"@0]                   |
+      | [:like "Danny Green"->"Tim Duncan"@0]       | ("Aron Baynes")       | [:like "Tim Duncan"->"Manu Ginobili"@0]         | ("Pistons")        | [:serve "Rudy Gay"->"Spurs"@0]                   |
+      | [:like "Dejounte Murray"->"Tim Duncan"@0]   | ("Boris Diaw")        | [:like "Tony Parker"->"Manu Ginobili"@0]        | ("Damian Lillard") | [:teammate "Manu Ginobili"->"Tim Duncan"@0]      |
+      | [:like "LaMarcus Aldridge"->"Tim Duncan"@0] | ("Shaquile O\'Neal")  | [:serve "Danny Green"->"Cavaliers"@0]           | ("Kings")          | [:teammate "Tony Parker"->"Tim Duncan"@0]        |
+      | [:like "Manu Ginobili"->"Tim Duncan"@0]     | ("Dejounte Murray")   | [:serve "Danny Green"->"Raptors"@0]             | ("Hornets")        | [:teammate "Tim Duncan"->"Danny Green"@0]        |
+      | [:like "Marco Belinelli"->"Tim Duncan"@0]   | ("LaMarcus Aldridge") | [:serve "Danny Green"->"Spurs"@0]               | ("Spurs")          | [:teammate "Tim Duncan"->"LaMarcus Aldridge"@0]  |
+      | [:like "Shaquile O\'Neal"->"Tim Duncan"@0]  | ("Marco Belinelli")   | [:like "Dejounte Murray"->"Danny Green"@0]      | ("Rudy Gay")       | [:teammate "Tim Duncan"->"Manu Ginobili"@0]      |
+      | [:like "Tiago Splitter"->"Tim Duncan"@0]    | ("Tiago Splitter")    | [:like "Marco Belinelli"->"Danny Green"@0]      | ("Yao Ming")       | [:teammate "Tim Duncan"->"Tony Parker"@0]        |
+      | [:like "Tony Parker"->"Tim Duncan"@0]       |                       | [:serve "Tony Parker"->"Hornets"@0]             | ("Hawks")          | [:teammate "Manu Ginobili"->"Tony Parker"@0]     |
+      |                                             |                       | [:serve "Tony Parker"->"Spurs"@0]               | ("Heat")           | [:teammate "Tony Parker"->"LaMarcus Aldridge"@0] |
+      |                                             |                       | [:like "Boris Diaw"->"Tony Parker"@0]           | ("Lakers")         | [:teammate "Tony Parker"->"Manu Ginobili"@0]     |
+      |                                             |                       | [:like "Dejounte Murray"->"Tony Parker"@0]      | ("Celtics")        |                                                  |
+      |                                             |                       | [:like "LaMarcus Aldridge"->"Tony Parker"@0]    | ("Suns")           |                                                  |
+      |                                             |                       | [:like "Marco Belinelli"->"Tony Parker"@0]      | ("Magic")          |                                                  |
+      |                                             |                       | [:like "Tim Duncan"->"Tony Parker"@0]           | ("Trail Blazers")  |                                                  |
+      |                                             |                       | [:serve "Aron Baynes"->"Celtics"@0]             | ("76ers")          |                                                  |
+      |                                             |                       | [:serve "Aron Baynes"->"Pistons"@0]             | ("Bulls")          |                                                  |
+      |                                             |                       | [:serve "Aron Baynes"->"Spurs"@0]               | ("Warriors")       |                                                  |
+      |                                             |                       | [:serve "Boris Diaw"->"Hawks"@0]                |                    |                                                  |
+      |                                             |                       | [:serve "Boris Diaw"->"Hornets"@0]              |                    |                                                  |
+      |                                             |                       | [:serve "Boris Diaw"->"Jazz"@0]                 |                    |                                                  |
+      |                                             |                       | [:serve "Boris Diaw"->"Spurs"@0]                |                    |                                                  |
+      |                                             |                       | [:serve "Boris Diaw"->"Suns"@0]                 |                    |                                                  |
+      |                                             |                       | [:serve "Shaquile O\'Neal"->"Cavaliers"@0]      |                    |                                                  |
+      |                                             |                       | [:serve "Shaquile O\'Neal"->"Celtics"@0]        |                    |                                                  |
+      |                                             |                       | [:serve "Shaquile O\'Neal"->"Heat"@0]           |                    |                                                  |
+      |                                             |                       | [:serve "Shaquile O\'Neal"->"Lakers"@0]         |                    |                                                  |
+      |                                             |                       | [:serve "Shaquile O\'Neal"->"Magic"@0]          |                    |                                                  |
+      |                                             |                       | [:serve "Shaquile O\'Neal"->"Suns"@0]           |                    |                                                  |
+      |                                             |                       | [:like "Yao Ming"->"Shaquile O\'Neal"@0]        |                    |                                                  |
+      |                                             |                       | [:serve "Dejounte Murray"->"Spurs"@0]           |                    |                                                  |
+      |                                             |                       | [:serve "LaMarcus Aldridge"->"Spurs"@0]         |                    |                                                  |
+      |                                             |                       | [:serve "LaMarcus Aldridge"->"Trail Blazers"@0] |                    |                                                  |
+      |                                             |                       | [:like "Damian Lillard"->"LaMarcus Aldridge"@0] |                    |                                                  |
+      |                                             |                       | [:like "Rudy Gay"->"LaMarcus Aldridge"@0]       |                    |                                                  |
+      |                                             |                       | [:like "Tony Parker"->"LaMarcus Aldridge"@0]    |                    |                                                  |
+      |                                             |                       | [:serve "Marco Belinelli"->"76ers"@0]           |                    |                                                  |
+      |                                             |                       | [:serve "Marco Belinelli"->"Bulls"@0]           |                    |                                                  |
+      |                                             |                       | [:serve "Marco Belinelli"->"Hawks"@0]           |                    |                                                  |
+      |                                             |                       | [:serve "Marco Belinelli"->"Hornets"@0]         |                    |                                                  |
+      |                                             |                       | [:serve "Marco Belinelli"->"Kings"@0]           |                    |                                                  |
+      |                                             |                       | [:serve "Marco Belinelli"->"Raptors"@0]         |                    |                                                  |
+      |                                             |                       | [:serve "Marco Belinelli"->"Spurs"@0]           |                    |                                                  |
+      |                                             |                       | [:serve "Marco Belinelli"->"Warriors"@0]        |                    |                                                  |
+      |                                             |                       | [:serve "Marco Belinelli"->"Hornets"@1]         |                    |                                                  |
+      |                                             |                       | [:serve "Marco Belinelli"->"Spurs"@1]           |                    |                                                  |
+      |                                             |                       | [:like "Danny Green"->"Marco Belinelli"@0]      |                    |                                                  |
+      |                                             |                       | [:like "Dejounte Murray"->"Marco Belinelli"@0]  |                    |                                                  |
+      |                                             |                       | [:serve "Tiago Splitter"->"76ers"@0]            |                    |                                                  |
+      |                                             |                       | [:serve "Tiago Splitter"->"Hawks"@0]            |                    |                                                  |
+      |                                             |                       | [:serve "Tiago Splitter"->"Spurs"@0]            |                    |                                                  |
     Then the result should be, in any order, with relax comparison:
-      | _vertices | _edges |
-      | vertex1   | edge1  |
-      | vertex2   | edge2  |
-      | vertex3   | edge3  |
+      | _vertices        | _edges    |
+      | [("Tim Duncan")] | <[edge1]> |
+      | <[vertex2]>      | <[edge2]> |
+      | <[vertex3]>      | <[edge3]> |
 
   Scenario: two steps in and out edge
     When executing query:
       """
       GET SUBGRAPH 2 STEPS FROM 'Tim Duncan', 'James Harden' IN teammate OUT serve
       """
-    Then example
-      | vertex1          | edge1                                       | vertex2           | edge2                                        | vertex3     | edge3                                    |
-      | ("Tim Duncan")   | [:serve "Tim Duncan"->"Spurs"@0]            | ("Manu Ginobili") | [:serve "Manu Ginobili"->"Spurs"@0]          | ("Hornets") | [:like "Manu Ginobili"->"Tim Duncan"@0]  |
-      | ("James Harden") | [:teammate "Manu Ginobili"->"Tim Duncan"@0] | ("Tony Parker")   | [:teammate "Tim Duncan"->"Manu Ginobili"@0]  | ("Spurs")   | [:like "Tony Parker"->"Tim Duncan"@0]    |
-      |                  | [:teammate "Tony Parker"->"Tim Duncan"@0]   |                   | [:teammate "Tony Parker"->"Manu Ginobili"@0] |             | [:like "Tim Duncan"->"Manu Ginobili"@0]  |
-      |                  | [:serve "James Harden"->"Rockets"@0]        |                   | [:serve "Tony Parker"->"Hornets"@0]          |             | [:like "Tim Duncan"->"Tony Parker"@0]    |
-      |                  | [:serve "James Harden"->"Thunders"@0]       |                   | [:serve "Tony Parker"->"Spurs"@0]            |             | [:like "Tony Parker"->"Manu Ginobili"@0] |
-      |                  |                                             |                   | [:teammate "Manu Ginobili"->"Tony Parker"@0] |             |                                          |
-      |                  |                                             |                   | [:teammate "Tim Duncan"->"Tony Parker"@0]    |             |                                          |
+    Then define some list variables:
+      | edge1                                       | edge2                                        | edge3                                    |
+      | [:serve "Tim Duncan"->"Spurs"@0]            | [:serve "Manu Ginobili"->"Spurs"@0]          | [:like "Manu Ginobili"->"Tim Duncan"@0]  |
+      | [:teammate "Manu Ginobili"->"Tim Duncan"@0] | [:teammate "Tim Duncan"->"Manu Ginobili"@0]  | [:like "Tony Parker"->"Tim Duncan"@0]    |
+      | [:teammate "Tony Parker"->"Tim Duncan"@0]   | [:teammate "Tony Parker"->"Manu Ginobili"@0] | [:like "Tim Duncan"->"Manu Ginobili"@0]  |
+      | [:serve "James Harden"->"Rockets"@0]        | [:serve "Tony Parker"->"Hornets"@0]          | [:like "Tim Duncan"->"Tony Parker"@0]    |
+      | [:serve "James Harden"->"Thunders"@0]       | [:serve "Tony Parker"->"Spurs"@0]            | [:like "Tony Parker"->"Manu Ginobili"@0] |
+      |                                             | [:teammate "Manu Ginobili"->"Tony Parker"@0] |                                          |
+      |                                             | [:teammate "Tim Duncan"->"Tony Parker"@0]    |                                          |
     Then the result should be, in any order, with relax comparison:
-      | _vertices | _edges |
-      | vertex1   | edge1  |
-      | vertex2   | edge2  |
-      | vertex3   | edge3  |
+      | _vertices                            | _edges    |
+      | [("Tim Duncan"), ("James Harden")]   | <[edge1]> |
+      | [("Manu Ginobili"), ("Tony Parker")] | <[edge2]> |
+      | [("Hornets"), ("Spurs")]             | <[edge3]> |
 
   Scenario: three steps
     When executing query:
       """
       GET SUBGRAPH 3 STEPS FROM 'Paul George' OUT serve BOTH like
       """
-    Then example
-      | vertex1         | edge1                                        | vertex2               | edge2                                            | vertex3             | edge3                                          | vertex4             | edge4                                        |
-      | ("Paul George") | [:like "Russell Westbrook"->"Paul George"@0] | ("Russell Westbrook") | [:like "Dejounte Murray"->"Russell Westbrook"@0] | ("Dejounte Murray") | [:serve "Dejounte Murray"->"Spurs"@0]          | ("LeBron James")    | [:like "Chris Paul"->"LeBron James"@0]       |
-      |                 | [:serve "Paul George"->"Pacers"@0]           |                       | [:like "James Harden"->"Russell Westbrook"@0]    | ("James Harden")    | [:like "Dejounte Murray"->"Chris Paul"@0]      | ("Marco Belinelli") | [:like "Danny Green"->"LeBron James"@0]      |
-      |                 | [:serve "Paul George"->"Thunders"@0]         |                       | [:serve "Russell Westbrook"->"Thunders"@0]       |                     | [:like "Dejounte Murray"->"Danny Green"@0]     | ("Danny Green")     | [:like "Danny Green"->"Marco Belinelli"@0]   |
-      |                 | [:like "Paul George"->"Russell Westbrook"@0] |                       | [:like "Russell Westbrook"->"James Harden"@0]    |                     | [:like "Dejounte Murray"->"James Harden"@0]    | ("Rockets")         | [:like "Marco Belinelli"->"Danny Green"@0]   |
-      |                 |                                              |                       |                                                  |                     | [:like "Dejounte Murray"->"Kevin Durant"@0]    | ("Spurs")           | [:like "Marco Belinelli"->"Tim Duncan"@0]    |
-      |                 |                                              |                       |                                                  |                     | [:like "Dejounte Murray"->"Kyle Anderson"@0]   | ("Kevin Durant")    | [:like "Marco Belinelli"->"Tony Parker"@0]   |
-      |                 |                                              |                       |                                                  |                     | [:like "Dejounte Murray"->"LeBron James"@0]    | ("Kyle Anderson")   | [:serve "Marco Belinelli"->"Spurs"@0]        |
-      |                 |                                              |                       |                                                  |                     | [:like "Dejounte Murray"->"Manu Ginobili"@0]   | ("Tim Duncan")      | [:serve "Marco Belinelli"->"Spurs"@1]        |
-      |                 |                                              |                       |                                                  |                     | [:like "Dejounte Murray"->"Marco Belinelli"@0] | ("Tony Parker")     | [:teammate "Tim Duncan"->"Danny Green"@0]    |
-      |                 |                                              |                       |                                                  |                     | [:like "Dejounte Murray"->"Tim Duncan"@0]      | ("Chris Paul")      | [:like "Danny Green"->"Tim Duncan"@0]        |
-      |                 |                                              |                       |                                                  |                     | [:like "Dejounte Murray"->"Tony Parker"@0]     | ("Luka Doncic")     | [:serve "Danny Green"->"Spurs"@0]            |
-      |                 |                                              |                       |                                                  |                     | [:like "Luka Doncic"->"James Harden"@0]        | ("Manu Ginobili")   | [:serve "Chris Paul"->"Rockets"@0]           |
-      |                 |                                              |                       |                                                  |                     | [:serve "James Harden"->"Rockets"@0]           | ("Pacers")          | [:serve "Kyle Anderson"->"Spurs"@0]          |
-      |                 |                                              |                       |                                                  |                     | [:serve "James Harden"->"Thunders"@0]          | ("Thunders")        | [:serve "Manu Ginobili"->"Spurs"@0]          |
-      |                 |                                              |                       |                                                  |                     |                                                |                     | [:serve "Tim Duncan"->"Spurs"@0]             |
-      |                 |                                              |                       |                                                  |                     |                                                |                     | [:serve "Tony Parker"->"Spurs"@0]            |
-      |                 |                                              |                       |                                                  |                     |                                                |                     | [:serve "Kevin Durant"->"Thunders"@0]        |
-      |                 |                                              |                       |                                                  |                     |                                                |                     | [:teammate "Tony Parker"->"Kyle Anderson"@0] |
-      |                 |                                              |                       |                                                  |                     |                                                |                     | [:teammate "Manu Ginobili"->"Tim Duncan"@0]  |
-      |                 |                                              |                       |                                                  |                     |                                                |                     | [:teammate "Tony Parker"->"Tim Duncan"@0]    |
-      |                 |                                              |                       |                                                  |                     |                                                |                     | [:like "Manu Ginobili"->"Tim Duncan"@0]      |
-      |                 |                                              |                       |                                                  |                     |                                                |                     | [:like "Tony Parker"->"Tim Duncan"@0]        |
-      |                 |                                              |                       |                                                  |                     |                                                |                     | [:like "Tim Duncan"->"Manu Ginobili"@0]      |
-      |                 |                                              |                       |                                                  |                     |                                                |                     | [:like "Tim Duncan"->"Tony Parker"@0]        |
-      |                 |                                              |                       |                                                  |                     |                                                |                     | [:teammate "Tim Duncan"->"Manu Ginobili"@0]  |
-      |                 |                                              |                       |                                                  |                     |                                                |                     | [:teammate "Tim Duncan"->"Tony Parker"@0]    |
-      |                 |                                              |                       |                                                  |                     |                                                |                     | [:teammate "Manu Ginobili"->"Tony Parker"@0] |
-      |                 |                                              |                       |                                                  |                     |                                                |                     | [:like "Tony Parker"->"Manu Ginobili"@0]     |
-      |                 |                                              |                       |                                                  |                     |                                                |                     | [:teammate "Tony Parker"->"Manu Ginobili"@0] |
+    Then define some list variables:
+      | edge1                                        | edge2                                            | edge3                                          | vertex4             | edge4                                        |
+      | [:like "Russell Westbrook"->"Paul George"@0] | [:like "Dejounte Murray"->"Russell Westbrook"@0] | [:serve "Dejounte Murray"->"Spurs"@0]          | ("LeBron James")    | [:like "Chris Paul"->"LeBron James"@0]       |
+      | [:serve "Paul George"->"Pacers"@0]           | [:like "James Harden"->"Russell Westbrook"@0]    | [:like "Dejounte Murray"->"Chris Paul"@0]      | ("Marco Belinelli") | [:like "Danny Green"->"LeBron James"@0]      |
+      | [:serve "Paul George"->"Thunders"@0]         | [:serve "Russell Westbrook"->"Thunders"@0]       | [:like "Dejounte Murray"->"Danny Green"@0]     | ("Danny Green")     | [:like "Danny Green"->"Marco Belinelli"@0]   |
+      | [:like "Paul George"->"Russell Westbrook"@0] | [:like "Russell Westbrook"->"James Harden"@0]    | [:like "Dejounte Murray"->"James Harden"@0]    | ("Rockets")         | [:like "Marco Belinelli"->"Danny Green"@0]   |
+      |                                              |                                                  | [:like "Dejounte Murray"->"Kevin Durant"@0]    | ("Spurs")           | [:like "Marco Belinelli"->"Tim Duncan"@0]    |
+      |                                              |                                                  | [:like "Dejounte Murray"->"Kyle Anderson"@0]   | ("Kevin Durant")    | [:like "Marco Belinelli"->"Tony Parker"@0]   |
+      |                                              |                                                  | [:like "Dejounte Murray"->"LeBron James"@0]    | ("Kyle Anderson")   | [:serve "Marco Belinelli"->"Spurs"@0]        |
+      |                                              |                                                  | [:like "Dejounte Murray"->"Manu Ginobili"@0]   | ("Tim Duncan")      | [:serve "Marco Belinelli"->"Spurs"@1]        |
+      |                                              |                                                  | [:like "Dejounte Murray"->"Marco Belinelli"@0] | ("Tony Parker")     | [:teammate "Tim Duncan"->"Danny Green"@0]    |
+      |                                              |                                                  | [:like "Dejounte Murray"->"Tim Duncan"@0]      | ("Chris Paul")      | [:like "Danny Green"->"Tim Duncan"@0]        |
+      |                                              |                                                  | [:like "Dejounte Murray"->"Tony Parker"@0]     | ("Luka Doncic")     | [:serve "Danny Green"->"Spurs"@0]            |
+      |                                              |                                                  | [:like "Luka Doncic"->"James Harden"@0]        | ("Manu Ginobili")   | [:serve "Chris Paul"->"Rockets"@0]           |
+      |                                              |                                                  | [:serve "James Harden"->"Rockets"@0]           | ("Pacers")          | [:serve "Kyle Anderson"->"Spurs"@0]          |
+      |                                              |                                                  | [:serve "James Harden"->"Thunders"@0]          | ("Thunders")        | [:serve "Manu Ginobili"->"Spurs"@0]          |
+      |                                              |                                                  |                                                |                     | [:serve "Tim Duncan"->"Spurs"@0]             |
+      |                                              |                                                  |                                                |                     | [:serve "Tony Parker"->"Spurs"@0]            |
+      |                                              |                                                  |                                                |                     | [:serve "Kevin Durant"->"Thunders"@0]        |
+      |                                              |                                                  |                                                |                     | [:teammate "Tony Parker"->"Kyle Anderson"@0] |
+      |                                              |                                                  |                                                |                     | [:teammate "Manu Ginobili"->"Tim Duncan"@0]  |
+      |                                              |                                                  |                                                |                     | [:teammate "Tony Parker"->"Tim Duncan"@0]    |
+      |                                              |                                                  |                                                |                     | [:like "Manu Ginobili"->"Tim Duncan"@0]      |
+      |                                              |                                                  |                                                |                     | [:like "Tony Parker"->"Tim Duncan"@0]        |
+      |                                              |                                                  |                                                |                     | [:like "Tim Duncan"->"Manu Ginobili"@0]      |
+      |                                              |                                                  |                                                |                     | [:like "Tim Duncan"->"Tony Parker"@0]        |
+      |                                              |                                                  |                                                |                     | [:teammate "Tim Duncan"->"Manu Ginobili"@0]  |
+      |                                              |                                                  |                                                |                     | [:teammate "Tim Duncan"->"Tony Parker"@0]    |
+      |                                              |                                                  |                                                |                     | [:teammate "Manu Ginobili"->"Tony Parker"@0] |
+      |                                              |                                                  |                                                |                     | [:like "Tony Parker"->"Manu Ginobili"@0]     |
+      |                                              |                                                  |                                                |                     | [:teammate "Tony Parker"->"Manu Ginobili"@0] |
     Then the result should be, in any order, with relax comparison:
-      | _vertices | _edges |
-      | vertex1   | edge1  |
-      | vertex2   | edge2  |
-      | vertex3   | edge3  |
-      | vertex4   | edge4  |
+      | _vertices                               | _edges    |
+      | [("Paul George")]                       | <[edge1]> |
+      | [("Russell Westbrook")]                 | <[edge2]> |
+      | [("Dejounte Murray"), ("James Harden")] | <[edge3]> |
+      | <[vertex4]>                             | <[edge4]> |
 
   Scenario: bidirect edge
     When executing query:
       """
       GET SUBGRAPH FROM 'Tony Parker' BOTH like
       """
-    Then example
-      | vertex1         | edge1                                        | vertex2               | edge2                                            |
-      | ("Tony Parker") | [:like "Boris Diaw"->"Tony Parker"@0]        | ("Dejounte Murray")   | [:like "Dejounte Murray"->"Manu Ginobili"@0]     |
-      |                 | [:like "Dejounte Murray"->"Tony Parker"@0]   | ("LaMarcus Aldridge") | [:like "Dejounte Murray"->"Marco Belinelli"@0]   |
-      |                 | [:like "LaMarcus Aldridge"->"Tony Parker"@0] | ("Marco Belinelli")   | [:like "Dejounte Murray"->"Tim Duncan"@0]        |
-      |                 | [:like "Marco Belinelli"->"Tony Parker"@0]   | ("Boris Diaw")        | [:teammate "Tim Duncan"->"LaMarcus Aldridge"@0]  |
-      |                 | [:like "Tim Duncan"->"Tony Parker"@0]        | ("Tim Duncan")        | [:teammate "Tony Parker"->"LaMarcus Aldridge"@0] |
-      |                 | [:like "Tony Parker"->"LaMarcus Aldridge"@0] | ("Manu Ginobili")     | [:like "LaMarcus Aldridge"->"Tim Duncan"@0]      |
-      |                 | [:like "Tony Parker"->"Manu Ginobili"@0]     |                       | [:like "Marco Belinelli"->"Tim Duncan"@0]        |
-      |                 | [:like "Tony Parker"->"Tim Duncan"@0]        |                       | [:like "Boris Diaw"->"Tim Duncan"@0]             |
-      |                 |                                              |                       | [:teammate "Manu Ginobili"->"Tim Duncan"@0]      |
-      |                 |                                              |                       | [:teammate "Tony Parker"->"Tim Duncan"@0]        |
-      |                 |                                              |                       | [:like "Manu Ginobili"->"Tim Duncan"@0]          |
-      |                 |                                              |                       | [:like "Tim Duncan"->"Manu Ginobili"@0]          |
-      |                 |                                              |                       | [:teammate "Tim Duncan"->"Manu Ginobili"@0]      |
-      |                 |                                              |                       | [:teammate "Tim Duncan"->"Tony Parker"@0]        |
-      |                 |                                              |                       | [:teammate "Tony Parker"->"Manu Ginobili"@0]     |
-      |                 |                                              |                       | [:teammate "Manu Ginobili"->"Tony Parker"@0]     |
+    Then define some list variables:
+      | edge1                                        | vertex2               | edge2                                            |
+      | [:like "Boris Diaw"->"Tony Parker"@0]        | ("Dejounte Murray")   | [:like "Dejounte Murray"->"Manu Ginobili"@0]     |
+      | [:like "Dejounte Murray"->"Tony Parker"@0]   | ("LaMarcus Aldridge") | [:like "Dejounte Murray"->"Marco Belinelli"@0]   |
+      | [:like "LaMarcus Aldridge"->"Tony Parker"@0] | ("Marco Belinelli")   | [:like "Dejounte Murray"->"Tim Duncan"@0]        |
+      | [:like "Marco Belinelli"->"Tony Parker"@0]   | ("Boris Diaw")        | [:teammate "Tim Duncan"->"LaMarcus Aldridge"@0]  |
+      | [:like "Tim Duncan"->"Tony Parker"@0]        | ("Tim Duncan")        | [:teammate "Tony Parker"->"LaMarcus Aldridge"@0] |
+      | [:like "Tony Parker"->"LaMarcus Aldridge"@0] | ("Manu Ginobili")     | [:like "LaMarcus Aldridge"->"Tim Duncan"@0]      |
+      | [:like "Tony Parker"->"Manu Ginobili"@0]     |                       | [:like "Marco Belinelli"->"Tim Duncan"@0]        |
+      | [:like "Tony Parker"->"Tim Duncan"@0]        |                       | [:like "Boris Diaw"->"Tim Duncan"@0]             |
+      |                                              |                       | [:teammate "Manu Ginobili"->"Tim Duncan"@0]      |
+      |                                              |                       | [:teammate "Tony Parker"->"Tim Duncan"@0]        |
+      |                                              |                       | [:like "Manu Ginobili"->"Tim Duncan"@0]          |
+      |                                              |                       | [:like "Tim Duncan"->"Manu Ginobili"@0]          |
+      |                                              |                       | [:teammate "Tim Duncan"->"Manu Ginobili"@0]      |
+      |                                              |                       | [:teammate "Tim Duncan"->"Tony Parker"@0]        |
+      |                                              |                       | [:teammate "Tony Parker"->"Manu Ginobili"@0]     |
+      |                                              |                       | [:teammate "Manu Ginobili"->"Tony Parker"@0]     |
     Then the result should be, in any order, with relax comparison:
-      | _vertices | _edges |
-      | vertex1   | edge1  |
-      | vertex2   | edge2  |
+      | _vertices         | _edges    |
+      | [("Tony Parker")] | <[edge1]> |
+      | <[vertex2]>       | <[edge2]> |
 
   Scenario: pipe
     When executing query:
       """
       GO FROM 'Tim Duncan' over serve YIELD serve._src AS id | GET SUBGRAPH FROM $-.id
       """
-    Then example
-      | vertex1        | edge1                                           | vertex2               | edge2                                            |
-      | ("Tim Duncan") | [:teammate "Manu Ginobili"->"Tim Duncan"@0]     | ("Danny Green")       | [:like "Dejounte Murray"->"Danny Green"@0]       |
-      |                | [:teammate "Tony Parker"->"Tim Duncan"@0]       | ("Manu Ginobili")     | [:like "Marco Belinelli"->"Danny Green"@0]       |
-      |                | [:like "Aron Baynes"->"Tim Duncan"@0]           | ("Aron Baynes")       | [:like "Danny Green"->"Marco Belinelli"@0]       |
-      |                | [:like "Boris Diaw"->"Tim Duncan"@0]            | ("Boris Diaw")        | [:serve "Danny Green"->"Spurs"@0]                |
-      |                | [:like "Danny Green"->"Tim Duncan"@0]           | ("Shaquile O\'Neal")  | [:teammate "Tony Parker"->"Manu Ginobili"@0]     |
-      |                | [:like "Dejounte Murray"->"Tim Duncan"@0]       | ("Tony Parker")       | [:like "Dejounte Murray"->"Manu Ginobili"@0]     |
-      |                | [:like "LaMarcus Aldridge"->"Tim Duncan"@0]     | ("Spurs")             | [:like "Tiago Splitter"->"Manu Ginobili"@0]      |
-      |                | [:like "Manu Ginobili"->"Tim Duncan"@0]         | ("Dejounte Murray")   | [:like "Tony Parker"->"Manu Ginobili"@0]         |
-      |                | [:like "Marco Belinelli"->"Tim Duncan"@0]       | ("LaMarcus Aldridge") | [:serve "Manu Ginobili"->"Spurs"@0]              |
-      |                | [:like "Shaquile O\'Neal"->"Tim Duncan"@0]      | ("Marco Belinelli")   | [:teammate "Manu Ginobili"->"Tony Parker"@0]     |
-      |                | [:like "Tiago Splitter"->"Tim Duncan"@0]        | ("Tiago Splitter")    | [:serve "Aron Baynes"->"Spurs"@0]                |
-      |                | [:like "Tony Parker"->"Tim Duncan"@0]           |                       | [:like "Boris Diaw"->"Tony Parker"@0]            |
-      |                | [:like "Tim Duncan"->"Manu Ginobili"@0]         |                       | [:serve "Boris Diaw"->"Spurs"@0]                 |
-      |                | [:like "Tim Duncan"->"Tony Parker"@0]           |                       | [:like "Dejounte Murray"->"Tony Parker"@0]       |
-      |                | [:serve "Tim Duncan"->"Spurs"@0]                |                       | [:like "LaMarcus Aldridge"->"Tony Parker"@0]     |
-      |                | [:teammate "Tim Duncan"->"Danny Green"@0]       |                       | [:like "Marco Belinelli"->"Tony Parker"@0]       |
-      |                | [:teammate "Tim Duncan"->"LaMarcus Aldridge"@0] |                       | [:like "Tony Parker"->"LaMarcus Aldridge"@0]     |
-      |                | [:teammate "Tim Duncan"->"Manu Ginobili"@0]     |                       | [:serve "Tony Parker"->"Spurs"@0]                |
-      |                | [:teammate "Tim Duncan"->"Tony Parker"@0]       |                       | [:teammate "Tony Parker"->"LaMarcus Aldridge"@0] |
-      |                |                                                 |                       | [:serve "Dejounte Murray"->"Spurs"@0]            |
-      |                |                                                 |                       | [:serve "LaMarcus Aldridge"->"Spurs"@0]          |
-      |                |                                                 |                       | [:serve "Marco Belinelli"->"Spurs"@0]            |
-      |                |                                                 |                       | [:serve "Tiago Splitter"->"Spurs"@0]             |
-      |                |                                                 |                       | [:serve "Marco Belinelli"->"Spurs"@1]            |
-      |                |                                                 |                       | [:like "Dejounte Murray"->"Marco Belinelli"@0]   |
+    Then define some list variables:
+      | edge1                                           | vertex2               | edge2                                            |
+      | [:teammate "Manu Ginobili"->"Tim Duncan"@0]     | ("Danny Green")       | [:like "Dejounte Murray"->"Danny Green"@0]       |
+      | [:teammate "Tony Parker"->"Tim Duncan"@0]       | ("Manu Ginobili")     | [:like "Marco Belinelli"->"Danny Green"@0]       |
+      | [:like "Aron Baynes"->"Tim Duncan"@0]           | ("Aron Baynes")       | [:like "Danny Green"->"Marco Belinelli"@0]       |
+      | [:like "Boris Diaw"->"Tim Duncan"@0]            | ("Boris Diaw")        | [:serve "Danny Green"->"Spurs"@0]                |
+      | [:like "Danny Green"->"Tim Duncan"@0]           | ("Shaquile O\'Neal")  | [:teammate "Tony Parker"->"Manu Ginobili"@0]     |
+      | [:like "Dejounte Murray"->"Tim Duncan"@0]       | ("Tony Parker")       | [:like "Dejounte Murray"->"Manu Ginobili"@0]     |
+      | [:like "LaMarcus Aldridge"->"Tim Duncan"@0]     | ("Spurs")             | [:like "Tiago Splitter"->"Manu Ginobili"@0]      |
+      | [:like "Manu Ginobili"->"Tim Duncan"@0]         | ("Dejounte Murray")   | [:like "Tony Parker"->"Manu Ginobili"@0]         |
+      | [:like "Marco Belinelli"->"Tim Duncan"@0]       | ("LaMarcus Aldridge") | [:serve "Manu Ginobili"->"Spurs"@0]              |
+      | [:like "Shaquile O\'Neal"->"Tim Duncan"@0]      | ("Marco Belinelli")   | [:teammate "Manu Ginobili"->"Tony Parker"@0]     |
+      | [:like "Tiago Splitter"->"Tim Duncan"@0]        | ("Tiago Splitter")    | [:serve "Aron Baynes"->"Spurs"@0]                |
+      | [:like "Tony Parker"->"Tim Duncan"@0]           |                       | [:like "Boris Diaw"->"Tony Parker"@0]            |
+      | [:like "Tim Duncan"->"Manu Ginobili"@0]         |                       | [:serve "Boris Diaw"->"Spurs"@0]                 |
+      | [:like "Tim Duncan"->"Tony Parker"@0]           |                       | [:like "Dejounte Murray"->"Tony Parker"@0]       |
+      | [:serve "Tim Duncan"->"Spurs"@0]                |                       | [:like "LaMarcus Aldridge"->"Tony Parker"@0]     |
+      | [:teammate "Tim Duncan"->"Danny Green"@0]       |                       | [:like "Marco Belinelli"->"Tony Parker"@0]       |
+      | [:teammate "Tim Duncan"->"LaMarcus Aldridge"@0] |                       | [:like "Tony Parker"->"LaMarcus Aldridge"@0]     |
+      | [:teammate "Tim Duncan"->"Manu Ginobili"@0]     |                       | [:serve "Tony Parker"->"Spurs"@0]                |
+      | [:teammate "Tim Duncan"->"Tony Parker"@0]       |                       | [:teammate "Tony Parker"->"LaMarcus Aldridge"@0] |
+      |                                                 |                       | [:serve "Dejounte Murray"->"Spurs"@0]            |
+      |                                                 |                       | [:serve "LaMarcus Aldridge"->"Spurs"@0]          |
+      |                                                 |                       | [:serve "Marco Belinelli"->"Spurs"@0]            |
+      |                                                 |                       | [:serve "Tiago Splitter"->"Spurs"@0]             |
+      |                                                 |                       | [:serve "Marco Belinelli"->"Spurs"@1]            |
+      |                                                 |                       | [:like "Dejounte Murray"->"Marco Belinelli"@0]   |
     Then the result should be, in any order, with relax comparison:
-      | _vertices | _edges |
-      | vertex1   | edge1  |
-      | vertex2   | edge2  |
+      | _vertices        | _edges    |
+      | [("Tim Duncan")] | <[edge1]> |
+      | <[vertex2]>      | <[edge2]> |
 
   Scenario: var
     When executing query:
@@ -446,34 +445,34 @@ Feature: subgraph
       $a = GO FROM 'Tim Duncan' over serve YIELD serve._src AS id;
       GET SUBGRAPH FROM $a.id
       """
-    Then example
-      | vertex1        | edge1                                           | vertex2               | edge2                                            |
-      | ("Tim Duncan") | [:teammate "Manu Ginobili"->"Tim Duncan"@0]     | ("Danny Green")       | [:like "Dejounte Murray"->"Danny Green"@0]       |
-      |                | [:teammate "Tony Parker"->"Tim Duncan"@0]       | ("Manu Ginobili")     | [:like "Marco Belinelli"->"Danny Green"@0]       |
-      |                | [:like "Aron Baynes"->"Tim Duncan"@0]           | ("Aron Baynes")       | [:like "Danny Green"->"Marco Belinelli"@0]       |
-      |                | [:like "Boris Diaw"->"Tim Duncan"@0]            | ("Boris Diaw")        | [:serve "Danny Green"->"Spurs"@0]                |
-      |                | [:like "Danny Green"->"Tim Duncan"@0]           | ("Shaquile O\'Neal")  | [:teammate "Tony Parker"->"Manu Ginobili"@0]     |
-      |                | [:like "Dejounte Murray"->"Tim Duncan"@0]       | ("Tony Parker")       | [:like "Dejounte Murray"->"Manu Ginobili"@0]     |
-      |                | [:like "LaMarcus Aldridge"->"Tim Duncan"@0]     | ("Spurs")             | [:like "Tiago Splitter"->"Manu Ginobili"@0]      |
-      |                | [:like "Manu Ginobili"->"Tim Duncan"@0]         | ("Dejounte Murray")   | [:like "Tony Parker"->"Manu Ginobili"@0]         |
-      |                | [:like "Marco Belinelli"->"Tim Duncan"@0]       | ("LaMarcus Aldridge") | [:serve "Manu Ginobili"->"Spurs"@0]              |
-      |                | [:like "Shaquile O\'Neal"->"Tim Duncan"@0]      | ("Marco Belinelli")   | [:teammate "Manu Ginobili"->"Tony Parker"@0]     |
-      |                | [:like "Tiago Splitter"->"Tim Duncan"@0]        | ("Tiago Splitter")    | [:serve "Aron Baynes"->"Spurs"@0]                |
-      |                | [:like "Tony Parker"->"Tim Duncan"@0]           |                       | [:like "Boris Diaw"->"Tony Parker"@0]            |
-      |                | [:like "Tim Duncan"->"Manu Ginobili"@0]         |                       | [:serve "Boris Diaw"->"Spurs"@0]                 |
-      |                | [:like "Tim Duncan"->"Tony Parker"@0]           |                       | [:like "Dejounte Murray"->"Tony Parker"@0]       |
-      |                | [:serve "Tim Duncan"->"Spurs"@0]                |                       | [:like "LaMarcus Aldridge"->"Tony Parker"@0]     |
-      |                | [:teammate "Tim Duncan"->"Danny Green"@0]       |                       | [:like "Marco Belinelli"->"Tony Parker"@0]       |
-      |                | [:teammate "Tim Duncan"->"LaMarcus Aldridge"@0] |                       | [:like "Tony Parker"->"LaMarcus Aldridge"@0]     |
-      |                | [:teammate "Tim Duncan"->"Manu Ginobili"@0]     |                       | [:serve "Tony Parker"->"Spurs"@0]                |
-      |                | [:teammate "Tim Duncan"->"Tony Parker"@0]       |                       | [:teammate "Tony Parker"->"LaMarcus Aldridge"@0] |
-      |                |                                                 |                       | [:serve "Dejounte Murray"->"Spurs"@0]            |
-      |                |                                                 |                       | [:serve "LaMarcus Aldridge"->"Spurs"@0]          |
-      |                |                                                 |                       | [:serve "Marco Belinelli"->"Spurs"@0]            |
-      |                |                                                 |                       | [:serve "Tiago Splitter"->"Spurs"@0]             |
-      |                |                                                 |                       | [:serve "Marco Belinelli"->"Spurs"@1]            |
-      |                |                                                 |                       | [:like "Dejounte Murray"->"Marco Belinelli"@0]   |
+    Then define some list variables:
+      | edge1                                           | vertex2               | edge2                                            |
+      | [:teammate "Manu Ginobili"->"Tim Duncan"@0]     | ("Danny Green")       | [:like "Dejounte Murray"->"Danny Green"@0]       |
+      | [:teammate "Tony Parker"->"Tim Duncan"@0]       | ("Manu Ginobili")     | [:like "Marco Belinelli"->"Danny Green"@0]       |
+      | [:like "Aron Baynes"->"Tim Duncan"@0]           | ("Aron Baynes")       | [:like "Danny Green"->"Marco Belinelli"@0]       |
+      | [:like "Boris Diaw"->"Tim Duncan"@0]            | ("Boris Diaw")        | [:serve "Danny Green"->"Spurs"@0]                |
+      | [:like "Danny Green"->"Tim Duncan"@0]           | ("Shaquile O\'Neal")  | [:teammate "Tony Parker"->"Manu Ginobili"@0]     |
+      | [:like "Dejounte Murray"->"Tim Duncan"@0]       | ("Tony Parker")       | [:like "Dejounte Murray"->"Manu Ginobili"@0]     |
+      | [:like "LaMarcus Aldridge"->"Tim Duncan"@0]     | ("Spurs")             | [:like "Tiago Splitter"->"Manu Ginobili"@0]      |
+      | [:like "Manu Ginobili"->"Tim Duncan"@0]         | ("Dejounte Murray")   | [:like "Tony Parker"->"Manu Ginobili"@0]         |
+      | [:like "Marco Belinelli"->"Tim Duncan"@0]       | ("LaMarcus Aldridge") | [:serve "Manu Ginobili"->"Spurs"@0]              |
+      | [:like "Shaquile O\'Neal"->"Tim Duncan"@0]      | ("Marco Belinelli")   | [:teammate "Manu Ginobili"->"Tony Parker"@0]     |
+      | [:like "Tiago Splitter"->"Tim Duncan"@0]        | ("Tiago Splitter")    | [:serve "Aron Baynes"->"Spurs"@0]                |
+      | [:like "Tony Parker"->"Tim Duncan"@0]           |                       | [:like "Boris Diaw"->"Tony Parker"@0]            |
+      | [:like "Tim Duncan"->"Manu Ginobili"@0]         |                       | [:serve "Boris Diaw"->"Spurs"@0]                 |
+      | [:like "Tim Duncan"->"Tony Parker"@0]           |                       | [:like "Dejounte Murray"->"Tony Parker"@0]       |
+      | [:serve "Tim Duncan"->"Spurs"@0]                |                       | [:like "LaMarcus Aldridge"->"Tony Parker"@0]     |
+      | [:teammate "Tim Duncan"->"Danny Green"@0]       |                       | [:like "Marco Belinelli"->"Tony Parker"@0]       |
+      | [:teammate "Tim Duncan"->"LaMarcus Aldridge"@0] |                       | [:like "Tony Parker"->"LaMarcus Aldridge"@0]     |
+      | [:teammate "Tim Duncan"->"Manu Ginobili"@0]     |                       | [:serve "Tony Parker"->"Spurs"@0]                |
+      | [:teammate "Tim Duncan"->"Tony Parker"@0]       |                       | [:teammate "Tony Parker"->"LaMarcus Aldridge"@0] |
+      |                                                 |                       | [:serve "Dejounte Murray"->"Spurs"@0]            |
+      |                                                 |                       | [:serve "LaMarcus Aldridge"->"Spurs"@0]          |
+      |                                                 |                       | [:serve "Marco Belinelli"->"Spurs"@0]            |
+      |                                                 |                       | [:serve "Tiago Splitter"->"Spurs"@0]             |
+      |                                                 |                       | [:serve "Marco Belinelli"->"Spurs"@1]            |
+      |                                                 |                       | [:like "Dejounte Murray"->"Marco Belinelli"@0]   |
     Then the result should be, in any order, with relax comparison:
-      | _vertices | _edges |
-      | vertex1   | edge1  |
-      | vertex2   | edge2  |
+      | _vertices        | _edges    |
+      | [("Tim Duncan")] | <[edge1]> |
+      | <[vertex2]>      | <[edge2]> |
diff --git a/tests/tck/utils/table.py b/tests/tck/utils/table.py
index 69f8adabe2ba70bad01caa4090c299336bbadaf5..c10ea8733f7589a5ac4ba621d14d372bc5d20fc4 100644
--- a/tests/tck/utils/table.py
+++ b/tests/tck/utils/table.py
@@ -5,14 +5,24 @@
 
 import csv
 import io
+import re
 
 from tests.tck.utils.nbv import parse
 from nebula2.common.ttypes import DataSet, Row, Value
 
+pattern = re.compile(r"^<\[(\w+)\]>$")
+
+
+def _parse_value(cell: str, variables: dict) -> Value:
+    m = pattern.match(cell)
+    if m:
+        var = m.group(1)
+        assert var in variables, f"Invalid expect variable usages: {cell}"
+        cell = variables.get(var, None)
+        assert cell is not None
 
-def _parse_value(cell: str) -> Value:
     value = parse(cell)
-    assert value is not None, f'parse error: column is {cell}'
+    assert value is not None, f"parse error: column is {cell}"
     return value
 
 
@@ -31,11 +41,12 @@ def table(text):
     }
 
 
-def dataset(string_table):
+def dataset(string_table, variables: dict):
     ds = DataSet()
     ds.column_names = string_table['column_names']
     ds.rows = [
-        Row(values=[_parse_value(row[column]) for column in ds.column_names])
-        for row in string_table['rows']
+        Row(values=[
+            _parse_value(row[column], variables) for column in ds.column_names
+        ]) for row in string_table['rows']
     ]
     return ds