<fix>:add op_project when two stage stable query(since order by ts) with...

<fix>:add op_project when two stage stable query(since order by ts) with arithm expression(e.g. pow + 2)

src/query/src/qPlan.c

@@ -697,6 +697,11 @@ SArray* createGlobalMergePlan(SQueryAttr* pQueryAttr) {
       taosArrayPush(plan, &op);
     }
 
+    if (pQueryAttr->pExpr2 != NULL) {
+      op = OP_Project;
+      taosArrayPush(plan, &op);
+    }
+  } else {
     if (pQueryAttr->pExpr2 != NULL) {
       op = OP_Project;
       taosArrayPush(plan, &op);