feat: support pseudo columns such as _qstart, _qend and _qduration

source/libs/planner/src/planOptimizer.c

@@ -2054,12 +2054,12 @@ static EDealRes mergeProjectionsExpr(SNode** pNode, void* pContext) {
                      ((SExprNode*)*pNode)->aliasName);
             nodesDestroyNode(*pNode);
             *pNode = pExpr;
-          }
-        }
-      }
-    }
             return DEAL_RES_IGNORE_CHILD;
           }
+        }
+      }
+    }
+  }
   return DEAL_RES_CONTINUE;
 }