[cherry-pick #1308]fix GetNeighborsIter::getEdge crash when no edge schema in space

src/context/Iterator.cpp

@@ -313,6 +313,9 @@ const Value& GetNeighborsIter::getEdgeProp(const std::string& edge,
     if (!valid()) {
         return Value::kNullValue;
     }
+    if (noEdge_) {
+        return Value::kEmpty;
+    }
 
     auto& currentEdge = currentEdgeName();
     if (edge != "*" &&
@@ -388,6 +391,9 @@ Value GetNeighborsIter::getEdge() const {
     if (!valid()) {
         return Value::kNullValue;
     }
+    if (noEdge_) {
+        return Value::kEmpty;
+    }
 
     Edge edge;
     auto edgeName = currentEdgeName().substr(1, std::string::npos);

tests/tck/features/match/Base.feature

@@ -387,6 +387,28 @@ Feature: Basic match
       | p                                                                      |
       | <("LeBron James")-[:like@0]->("Ray Allen")-[:like@0]->("Rajon Rondo")> |
 
+  Scenario: Match a path in a space which doesn't have edge schema
+    Given an empty graph
+    And create a space with following options:
+      | partition_num  | 9                |
+      | replica_factor | 1                |
+      | vid_type       | FIXED_STRING(20) |
+    And having executed:
+      """
+      CREATE TAG IF NOT EXISTS person(name string);
+      """
+    When try to execute query:
+      """
+      INSERT VERTEX person VALUES "Tom":("Tom")
+      """
+    Then the execution should be successful
+    When executing query:
+      """
+      MATCH p=(v)-[e*1]->(v2) WHERE id(v) IN ["Tom"] RETURN p
+      """
+    Then the result should be, in any order, with relax comparison:
+      | p |
+
   Scenario: Unsupported combination of some cypher clauses
     When executing query:
       """

tests/tck/features/subgraph/subgraph.feature

@@ -894,3 +894,27 @@ Feature: subgraph
       | <[vertex3]>      | <[edge3]> |
       | <[vertex4]>      | <[edge4]> |
       | <[vertex5]>      | []        |
+
+  Scenario: Get subgraph in a space which doesn't have edge schema
+    Given an empty graph
+    And create a space with following options:
+      | partition_num  | 9                |
+      | replica_factor | 1                |
+      | vid_type       | FIXED_STRING(20) |
+    And having executed:
+      """
+      CREATE TAG IF NOT EXISTS person(name string);
+      """
+    When try to execute query:
+      """
+      INSERT VERTEX person VALUES "Tom":("Tom")
+      """
+    Then the execution should be successful
+    When executing query:
+      """
+      GET SUBGRAPH 1 STEPS FROM "Tom"
+      """
+    Then the result should be, in any order, with relax comparison:
+      | _vertices | _edges |
+      | [("Tom")] | []     |
+      | []        | []     |