From a8d2e22ac2584381b3bb06c568340b9730c691e9 Mon Sep 17 00:00:00 2001
From: Haojun Liao <hjliao@taosdata.com>
Date: Sun, 9 Oct 2022 11:45:10 +0800
Subject: [PATCH] fix(query): clean result block before loading new results.

---
 source/libs/executor/src/scanoperator.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/source/libs/executor/src/scanoperator.c b/source/libs/executor/src/scanoperator.c
index 40fc8cb9a5..ea6dc26b5f 100644
--- a/source/libs/executor/src/scanoperator.c
+++ b/source/libs/executor/src/scanoperator.c
@@ -3089,6 +3089,7 @@ static SSDataBlock* doTagScan(SOperatorInfo* pOperator) {
   STagScanInfo* pInfo = pOperator->info;
   SExprInfo*    pExprInfo = &pOperator->exprSupp.pExprInfo[0];
   SSDataBlock*  pRes = pInfo->pRes;
+  blockDataCleanup(pRes);
 
   int32_t size = taosArrayGetSize(pInfo->pTableList->pTableList);
   if (size == 0) {