From 55e86072062dd9db4ac0bfe1bb8bd563ce033ba8 Mon Sep 17 00:00:00 2001
From: shenglian zhou <shenglian_zhou@163.com>
Date: Fri, 3 Nov 2023 10:17:23 +0800
Subject: [PATCH] fix: calc const optimization only when not tag scan

---
 source/libs/parser/src/parCalcConst.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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;
     }