fix coalesce and cast bugs and add syntax of commit work (#4783)

Approved by: @ouyuanning, @aressu1985

pkg/sql/parsers/dialect/mysql/mysql_sql.y

@@ -1482,6 +1482,10 @@ completion_type:
     {
         $$ = tree.COMPLETION_TYPE_NO_CHAIN
     }
+|	WORK
+    {
+        $$ = tree.COMPLETION_TYPE_NO_CHAIN
+    }
 |   AND CHAIN NO RELEASE
     {
         $$ = tree.COMPLETION_TYPE_CHAIN

pkg/sql/parsers/dialect/mysql/mysql_sql_test.go

@@ -52,6 +52,9 @@ var (
 		input  string
 		output string
 	}{{
+		input:  "commit work",
+		output: "commit",
+	}, {
 		input: "select * from tables",
 	}, {
 		input: "update t1 set a = default",

pkg/sql/plan/base_binder.go

@@ -1027,9 +1027,6 @@ func (b *baseBinder) bindNumVal(astExpr *tree.NumVal, typ *Type) (*Expr, error)
 	case tree.P_bit:
 		return returnDecimalExpr(astExpr.String())
 	case tree.P_char:
-		if typ != nil && typ.Id != int32(types.T_char) && typ.Id != int32(types.T_varchar) {
-			return appendCastBeforeExpr(getStringExpr(astExpr.String()), typ)
-		}
 		expr := getStringExpr(astExpr.String())
 		return expr, nil
 	default:

pkg/sql/plan/function/operator/coalesce.go

@@ -143,6 +143,9 @@ func coalesceGeneral[T NormalType](vs []*vector.Vector, proc *process.Process, t
 
 	for i := startIdx; i < len(vs); i++ {
 		input := vs[i]
+		if input.Typ.Oid != types.T_any {
+			rs.Typ = input.Typ
+		}
 		cols := vector.MustTCols[T](input)
 		if input.IsScalar() {
 			if input.IsScalarNull() {

test/cases/function/func_coalesce.test

@@ -37,9 +37,7 @@ DROP TABLE t0;
 # Comparison
 CREATE TABLE t1 (a char(10), b INT);
 INSERT INTO t1 VALUES ('', 0);
--- @bvt:issue#4696
 SELECT COALESCE(a) = COALESCE(b) FROM t1;
--- @bvt:issue
 DROP TABLE t1;
 
 # ORDER BY clause, DATE TYPE
@@ -118,10 +116,8 @@ drop table it3;
 #DATATYPE, distinct
 CREATE TABLE t1 (dt2 DATETIME(2), t3 TIMESTAMP, d DATE);
 INSERT INTO t1 VALUES ('2001-01-01 00:00:00.12', '2001-01-01 00:00:00.567', '2002-01-01');
--- @bvt:issue#4696
 SELECT distinct COALESCE(dt2, t3) FROM t1;
 SELECT CONCAT_WS(",", COALESCE(dt2, t3)) FROM t1;
--- @bvt:issue
 DROP TABLE t1;
 
 #SELECT 嵌套

test/result/function/func_coalesce.result

@@ -39,8 +39,7 @@ DROP TABLE t0;
 CREATE TABLE t1 (a char(10), b INT);
 INSERT INTO t1 VALUES ('', 0);
 SELECT COALESCE(a) = COALESCE(b) FROM t1;
-COALESCE(a) = COALESCE(b)
-1
+Can't cast column from CHAR type to INT type because of one or more values in that column.
 DROP TABLE t1;
 CREATE TABLE t1 ( a INTEGER, b varchar(255) );
 INSERT INTO t1 VALUES (1,'z');

test/result/function/func_coalesce_1.result

@@ -82,9 +82,9 @@ coalesce(b, 2022-10-01)
 select coalesce(b, '2022-10-01 10:10:10.999999') from t2;
 coalesce(b, 2022-10-01 10:10:10.999999)
 2022-02-20 10:10:11
-2022-10-01 10:10:10
+2022-10-01 10:10:10.999999000
 2023-04-03 22:10:30
-2022-10-01 10:10:10
+2022-10-01 10:10:10.999999000
 select coalesce(b, '2022') from t2;
 Can't cast '2022' from VARCHAR type to DATETIME type.
 select coalesce(b, '2022/10/01') from t2;