diff --git a/source/libs/function/src/builtinsimpl.c b/source/libs/function/src/builtinsimpl.c
index 93f3b6c109..e82093d07e 100644
--- a/source/libs/function/src/builtinsimpl.c
+++ b/source/libs/function/src/builtinsimpl.c
@@ -5649,7 +5649,7 @@ int32_t blockDistFinalize(SqlFunctionCtx* pCtx, SSDataBlock* pBlock) {
       len += x;
     }
 
-    if (num > 0) {
+    if (pData->blockRowsHisto[i] > 0) {
       double v = pData->blockRowsHisto[i] * 100.0 / pData->numOfBlocks;
       len += sprintf(st + VARSTR_HEADER_SIZE + len, "  %d (%.2f%c)", pData->blockRowsHisto[i], v, '%');
     }