diff --git a/source/libs/parser/src/parCalcConst.c b/source/libs/parser/src/parCalcConst.c
index 23ce3aa77d..0657f1a43d 100644
--- a/source/libs/parser/src/parCalcConst.c
+++ b/source/libs/parser/src/parCalcConst.c
@@ -285,7 +285,7 @@ static SNode* createConstantValue() {
 static int32_t calcConstProjections(SCalcConstContext* pCxt, SSelectStmt* pSelect, bool subquery) {
   SNode* pProj = NULL;
   WHERE_EACH(pProj, pSelect->pProjectionList) {
-    if (subquery && !pSelect->isDistinct && isUselessCol((SExprNode*)pProj)) {
+    if (subquery && !pSelect->isDistinct && !pSelect->tagScan && isUselessCol((SExprNode*)pProj)) {
       ERASE_NODE(pSelect->pProjectionList);
       continue;
     }