Fix get src prop dead loop in GetNeighborsIter (#801)

Co-authored-by: Yee <2520865+yixinglu@users.noreply.github.com>

src/context/Iterator.cpp

@@ -86,6 +86,9 @@ void GetNeighborsIter::goToFirstEdge() {
                     currentEdge_ = &currentEdge.getList();
                     valid_ = true;
                 }  // `edgeIdx_'
+                if (!valid_) {
+                    ++colIdx_;
+                }
             }  // `colIdx_'
             if (valid_) {
                 break;

src/validator/GoValidator.cpp

@@ -663,8 +663,6 @@ std::vector<storage::cpp2::VertexProp> GoValidator::buildDstVertexProps() {
 
 GetNeighbors::EdgeProps GoValidator::buildEdgeProps() {
     GetNeighbors::EdgeProps edgeProps;
-    VLOG(1) << exprProps_.srcTagProps().empty() << exprProps_.dstTagProps().empty() <<
-                exprProps_.edgeProps().empty();
     bool onlyInputPropsOrConstant = exprProps_.srcTagProps().empty() &&
                                     exprProps_.dstTagProps().empty() &&
                                     exprProps_.edgeProps().empty();