diff --git a/source/libs/function/src/builtinsimpl.c b/source/libs/function/src/builtinsimpl.c
index 417875838a4bfb16a8563410b11c4b3dac34d05d..1633065ea9dce85f33ef326ba00bd23dbe18a1c0 100644
--- a/source/libs/function/src/builtinsimpl.c
+++ b/source/libs/function/src/builtinsimpl.c
@@ -3627,8 +3627,7 @@ static int32_t doUpdateTupleData(SSerializeDataHandle* pHandle, const void* pBuf
 }
 
 static int32_t updateTupleData(SqlFunctionCtx* pCtx, int32_t rowIndex, const SSDataBlock* pSrcBlock, STuplePos* pPos) {
-  int32_t rowLen = 0;
-  int32_t completeRowSize = rowLen + pCtx->subsidiaries.num * sizeof(bool);
+  int32_t completeRowSize = pCtx->subsidiaries.rowLen + pCtx->subsidiaries.num * sizeof(bool);
   char* buf = serializeTupleData(pSrcBlock, rowIndex, &pCtx->subsidiaries, pCtx->subsidiaries.buf);
   doUpdateTupleData(&pCtx->saveHandle, buf, completeRowSize, pPos);
   return TSDB_CODE_SUCCESS;