diff --git a/src/query/src/qAggMain.c b/src/query/src/qAggMain.c
index 96eaeb48cffb332f76fd44d5a4c0f3a560b986d7..472f3f8fe115e48e8bce95af51cba221fc3a5119 100644
--- a/src/query/src/qAggMain.c
+++ b/src/query/src/qAggMain.c
@@ -5287,7 +5287,7 @@ SAggFunctionInfo aAggs[] = {{
                           },
                           {
                               // 17
-                              "ts_dummy",
+                              "ts",
                               TSDB_FUNC_TS_DUMMY,
                               TSDB_FUNC_TS_DUMMY,
                               TSDB_BASE_FUNC_SO | TSDB_FUNCSTATE_NEED_TS,
diff --git a/src/query/src/qExecutor.c b/src/query/src/qExecutor.c
index 5a0eecb549122b1701444419663a2693e7c4f084..8cc25f1fe6d5cd4c7bde613126f2c92881e7d497 100644
--- a/src/query/src/qExecutor.c
+++ b/src/query/src/qExecutor.c
@@ -4573,7 +4573,7 @@ SOperatorInfo* createDataBlocksOptScanInfo(void* pTsdbQueryHandle, SQueryRuntime
 }
 
 SArray* getOrderCheckColumns(SQueryAttr* pQuery) {
-  int32_t numOfCols = pQuery->pGroupbyExpr->numOfGroupCols;
+  int32_t numOfCols = pQuery->pGroupbyExpr == NULL? 0: pQuery->pGroupbyExpr->numOfGroupCols;
 
   SArray* pOrderColumns = NULL;
   if (numOfCols > 0) {
@@ -4612,7 +4612,7 @@ SArray* getOrderCheckColumns(SQueryAttr* pQuery) {
 }
 
 SArray* getResultGroupCheckColumns(SQueryAttr* pQuery) {
-  int32_t numOfCols = pQuery->pGroupbyExpr->numOfGroupCols;
+  int32_t numOfCols = pQuery->pGroupbyExpr == NULL? 0 : pQuery->pGroupbyExpr->numOfGroupCols;
 
   SArray* pOrderColumns = NULL;
   if (numOfCols > 0) {