diff --git a/source/libs/executor/src/scanoperator.c b/source/libs/executor/src/scanoperator.c
index ea834e90caeb931119f38f36b5629aa0d1fa4fba..f0827886a02956385d6dbe2d64b00a1f5c59f4c0 100644
--- a/source/libs/executor/src/scanoperator.c
+++ b/source/libs/executor/src/scanoperator.c
@@ -484,8 +484,8 @@ int32_t addTagPseudoColumnData(SReadHandle* pHandle, const SExprInfo* pExpr, int
   int32_t code = 0;
 
   // backup the rows
-  int32_t backupRows = (rows == 1) ? rows : pBlock->info.rows;
-  pBlock->info.rows = rows;
+  int32_t backupRows = pBlock->info.rows;
+  pBlock->info.rows = (rows < pBlock->info.rows) ? pBlock->info.rows : rows;
 
   bool            freeReader = false;
   STableCachedVal val = {0};