From 2d27248043d6b598cece1a1479ef3f4fc1c5e869 Mon Sep 17 00:00:00 2001
From: Haojun Liao <hjliao@taosdata.com>
Date: Tue, 5 Jul 2022 18:02:38 +0800
Subject: [PATCH] fix(query): set number of rows before assign column data.

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

diff --git a/source/libs/executor/src/scanoperator.c b/source/libs/executor/src/scanoperator.c
index 061b4ab3c5..4512ca1a78 100644
--- a/source/libs/executor/src/scanoperator.c
+++ b/source/libs/executor/src/scanoperator.c
@@ -1748,8 +1748,8 @@ int32_t buildSysDbTableInfo(const SSysTableScanInfo* pInfo, int32_t capacity) {
   getPerfDbMeta(&pSysDbTableMeta, &size);
   p->info.rows = buildDbTableInfoBlock(p, pSysDbTableMeta, size, TSDB_PERFORMANCE_SCHEMA_DB);
 
-  relocateColumnData(pInfo->pRes, pInfo->scanCols, p->pDataBlock, false);
   pInfo->pRes->info.rows = p->info.rows;
+  relocateColumnData(pInfo->pRes, pInfo->scanCols, p->pDataBlock, false);
   blockDataDestroy(p);
 
   return pInfo->pRes->info.rows;