diff --git a/source/libs/executor/src/scanoperator.c b/source/libs/executor/src/scanoperator.c
index 8cc2f72adb..9024f7a341 100644
--- a/source/libs/executor/src/scanoperator.c
+++ b/source/libs/executor/src/scanoperator.c
@@ -3763,8 +3763,9 @@ static int32_t stopSubTablesTableMergeScan(STableMergeScanInfo* pInfo) {
 
     taosMemoryFree(pSubTblsInfo);
     pInfo->pSubTablesMergeInfo = NULL;
+
+    taosMemoryTrim(0);
   }
-  taosMemoryTrim(0);
   return TSDB_CODE_SUCCESS;
 }