Merge pull request #15964 from taosdata/szhou/fixbug

fix: can not clear result info when stream computing

source/libs/function/src/builtinsimpl.c

@@ -498,8 +498,7 @@ int32_t functionFinalizeWithResultBuf(SqlFunctionCtx* pCtx, SSDataBlock* pBlock,
   SColumnInfoData* pCol = taosArrayGet(pBlock->pDataBlock, slotId);
 
   SResultRowEntryInfo* pResInfo = GET_RES_INFO(pCtx);
-  pResInfo->isNullRes = (pResInfo->numOfRes == 0) ? 1 : 0;
-  cleanupResultRowEntry(pResInfo);
+  pResInfo->isNullRes = (pResInfo->isNullRes == 1) ? 1 : (pResInfo->numOfRes == 0);;
 
   char* in = finalResult;
   colDataAppend(pCol, pBlock->info.rows, in, pResInfo->isNullRes);