fix getNeighborIter (#859)

* fix getNeighborIter

* add test case

* add noEdge_ indicate without Edge in getNeighborExecutor response

Co-authored-by: Yee <2520865+yixinglu@users.noreply.github.com>
(cherry picked from commit 3ebc305)

src/context/Iterator.cpp

@@ -30,6 +30,11 @@ GetNeighborsIter::GetNeighborsIter(std::shared_ptr<Value> value)
 void GetNeighborsIter::goToFirstEdge() {
     // Go to first edge
     for (currentDs_ = dsIndices_.begin(); currentDs_ < dsIndices_.end(); ++currentDs_) {
+        if (noEdge_) {
+            currentRow_ = currentDs_->ds->rows.begin();
+            valid_ = true;
+            break;
+        }
         for (currentRow_ = currentDs_->ds->rows.begin();
             currentRow_ < currentDs_->ds->rows.end(); ++currentRow_) {
             colIdx_ = currentDs_->colLowerBound + 1;
@@ -126,7 +131,9 @@ StatusOr<int64_t> GetNeighborsIter::buildIndex(DataSetIndex* dsIndex) {
             // It is "_vid", "_stats", "_expr" in this situation.
         }
     }
-
+    if (edgeStartIndex == -1) {
+        noEdge_ = true;
+    }
     dsIndex->colLowerBound = edgeStartIndex - 1;
     dsIndex->colUpperBound = colNames.size() - 1;
     return edgeStartIndex;
@@ -181,6 +188,11 @@ void GetNeighborsIter::next() {
         return;
     }
 
+    if (noEdge_) {
+        currentRow_++;
+        return;
+    }
+
     while (++edgeIdx_ > -1) {
         if (edgeIdx_ < edgeIdxUpperBound_) {
             const auto& currentEdge = currentCol_->operator[](edgeIdx_);

src/context/Iterator.h

@@ -340,6 +340,7 @@ class GetNeighborsIter final : public Iterator {
     int64_t                              colIdx_{-1};
     const List*                          currentCol_{nullptr};
 
+    bool                                 noEdge_{false};
     int64_t                              edgeIdx_{-1};
     int64_t                              edgeIdxUpperBound_{-1};
     const List*                          currentEdge_{nullptr};

tests/tck/features/go/GO.IntVid.feature

@@ -15,6 +15,21 @@ Feature: IntegerVid Go  Sentence
     Then the result should be, in any order, with relax comparison, and the columns 0 should be hashed:
       | serve._dst |
       | "Spurs"    |
+    When executing query:
+      """
+      GO FROM hash("Tim Duncan") OVER like YIELD $^.player.name as name, $^.player.age as age
+      """
+    Then the result should be, in any order, with relax comparison:
+      | name         | age |
+      | "Tim Duncan" | 42  |
+    When executing query:
+      """
+      GO FROM hash("Tim Duncan"), hash("Tony Parker") OVER like YIELD $^.player.name as name, $^.player.age as age
+      """
+    Then the result should be, in any order, with relax comparison:
+      | name          | age |
+      | "Tim Duncan"  | 42  |
+      | "Tony Parker" | 36  |
     When executing query:
       """
       GO FROM hash("Tim Duncan"), hash("Tim Duncan") OVER serve

tests/tck/features/go/GO.feature

@@ -15,6 +15,21 @@ Feature: Go Sentence
     Then the result should be, in any order, with relax comparison:
       | serve._dst |
       | "Spurs"    |
+    When executing query:
+      """
+      GO FROM "Tim Duncan" OVER like YIELD $^.player.name as name, $^.player.age as age
+      """
+    Then the result should be, in any order, with relax comparison:
+      | name         | age |
+      | "Tim Duncan" | 42  |
+    When executing query:
+      """
+      GO FROM "Tim Duncan", "Tony Parker" OVER like YIELD $^.player.name as name, $^.player.age as age
+      """
+    Then the result should be, in any order, with relax comparison:
+      | name          | age |
+      | "Tim Duncan"  | 42  |
+      | "Tony Parker" | 36  |
     When executing query:
       """
       GO FROM "Tim Duncan", "Tim Duncan" OVER serve