Use symbol names for header if missing token position

Summary:
This fixes a bug, where streaming would try to get the name of the symbol from
an invalid token position. For example, `MATCH (n) WITH n RETURN *`

Reviewers: florijan, mislav.bradac

Reviewed By: florijan, mislav.bradac

Subscribers: pullbot

Differential Revision: https://phabricator.memgraph.io/D811

src/query/interpreter.hpp

@@ -170,11 +170,9 @@ class Interpreter {
         // When the symbol is aliased or expanded from '*' (inside RETURN or
         // WITH), then there is no token position, so use symbol name.
         // Otherwise, find the name from stripped query.
-        if (symbol.token_position() == -1)
-          header.push_back(symbol.name());
-        else
-          header.push_back(
-              stripped.named_expressions().at(symbol.token_position()));
+        header.push_back(FindOr(stripped.named_expressions(),
+                                symbol.token_position(), symbol.name())
+                             .first);
       }
       stream.Header(header);
 

tests/qa/tck_engine/tests/memgraph_V1/features/with.feature

@@ -221,3 +221,18 @@ Feature: With
             | 1 |
             | 3 |
             | 5 |
+
+    Scenario: With test 15:
+        Given an empty graph
+        And having executed:
+            """
+            CREATE ({id: 0})
+            """
+        When executing query:
+            """
+            MATCH (n) WITH n RETURN *
+            """
+        Then the result should be:
+            | n         |
+            | ({id: 0}) |
+