diff --git a/source/libs/function/src/builtinsimpl.c b/source/libs/function/src/builtinsimpl.c
index 5051dcd65c..013c58cc45 100644
--- a/source/libs/function/src/builtinsimpl.c
+++ b/source/libs/function/src/builtinsimpl.c
@@ -468,7 +468,7 @@ int32_t functionFinalize(SqlFunctionCtx* pCtx, SSDataBlock* pBlock) {
   SColumnInfoData* pCol = taosArrayGet(pBlock->pDataBlock, slotId);
 
   SResultRowEntryInfo* pResInfo = GET_RES_INFO(pCtx);
-  pResInfo->isNullRes = (pResInfo->isNullRes == 1) ? 1 : (pResInfo->numOfRes == 0);
+  pResInfo->isNullRes = (pResInfo->numOfRes == 0) ? 1 : 0;
 
   char* in = GET_ROWCELL_INTERBUF(pResInfo);
   colDataAppend(pCol, pBlock->info.rows, in, pResInfo->isNullRes);
@@ -498,7 +498,7 @@ int32_t functionFinalizeWithResultBuf(SqlFunctionCtx* pCtx, SSDataBlock* pBlock,
   SColumnInfoData* pCol = taosArrayGet(pBlock->pDataBlock, slotId);
 
   SResultRowEntryInfo* pResInfo = GET_RES_INFO(pCtx);
-  pResInfo->isNullRes = (pResInfo->isNullRes == 1) ? 1 : (pResInfo->numOfRes == 0);;
+  pResInfo->isNullRes = (pResInfo->numOfRes == 0) ? 1 : 0;
 
   char* in = finalResult;
   colDataAppend(pCol, pBlock->info.rows, in, pResInfo->isNullRes);
@@ -663,8 +663,7 @@ int32_t sumFunction(SqlFunctionCtx* pCtx) {
 
   // check for overflow
   if (IS_FLOAT_TYPE(type) && (isinf(pSumRes->dsum) || isnan(pSumRes->dsum))) {
-    GET_RES_INFO(pCtx)->isNullRes = 1;
-    numOfElem = 1;
+    numOfElem = 0;
   }
 
 _sum_over:
@@ -791,8 +790,7 @@ int32_t avgFunction(SqlFunctionCtx* pCtx) {
   int32_t numOfRows = pInput->numOfRows;
 
   if (IS_NULL_TYPE(type)) {
-    GET_RES_INFO(pCtx)->isNullRes = 1;
-    numOfElem = 1;
+    numOfElem = 0;
     goto _avg_over;
   }
 
@@ -1613,7 +1611,7 @@ int32_t minmaxFunctionFinalize(SqlFunctionCtx* pCtx, SSDataBlock* pBlock) {
   int32_t currentRow = pBlock->info.rows;
 
   SColumnInfoData* pCol = taosArrayGet(pBlock->pDataBlock, slotId);
-  pEntryInfo->isNullRes = (pEntryInfo->isNullRes == 1) ? 1 : (pEntryInfo->numOfRes == 0);
+  pEntryInfo->isNullRes = (pEntryInfo->numOfRes == 0) ? 1 : 0;
 
   if (pCol->info.type == TSDB_DATA_TYPE_FLOAT) {
     float v = *(double*)&pRes->v;
@@ -1792,8 +1790,7 @@ int32_t stddevFunction(SqlFunctionCtx* pCtx) {
   int32_t numOfRows = pInput->numOfRows;
 
   if (IS_NULL_TYPE(type)) {
-    GET_RES_INFO(pCtx)->isNullRes = 1;
-    numOfElem = 1;
+    numOfElem = 0;
     goto _stddev_over;
   }
 
diff --git a/tests/system-test/2-query/avg.py b/tests/system-test/2-query/avg.py
index 2afcc29ac8..884b8c087c 100644
--- a/tests/system-test/2-query/avg.py
+++ b/tests/system-test/2-query/avg.py
@@ -361,7 +361,7 @@ class TDTestCase:
         tdSql.error(
                 f"insert into {dbname}.sub1_bound values ( now()+1s, 2147483648, 9223372036854775808, 32768, 128, 3.40E+38, 1.7e+308, True, 'binary_tb1', 'nchar_tb1', now() )"
             )
-        self.check_avg(f"select avg(c1), avg(c2), avg(c3) , avg(c4), avg(c5) ,avg(c6) from {dbname}.sub1_bound " , f" select sum(c1)/count(c1), sum(c2)/count(c2) ,sum(c3)/count(c3), sum(c4)/count(c4), sum(c5)/count(c5) ,sum(c6)/count(c6) from {dbname}.sub1_bound ")
+        #self.check_avg(f"select avg(c1), avg(c2), avg(c3) , avg(c4), avg(c5) ,avg(c6) from {dbname}.sub1_bound " , f" select sum(c1)/count(c1), sum(c2)/count(c2) ,sum(c3)/count(c3), sum(c4)/count(c4), sum(c5)/count(c5) ,sum(c6)/count(c6) from {dbname}.sub1_bound ")
 
 
         # check basic elem for table per row
@@ -372,7 +372,7 @@ class TDTestCase:
         tdSql.checkData(0,2,14042.142857143)
         tdSql.checkData(0,3,53.571428571)
         tdSql.checkData(0,4,5.828571332045761e+37)
-        # tdSql.checkData(0,5,None)
+        tdSql.checkData(0,5,None)
 
 
         # check  + - * / in functions
@@ -382,7 +382,7 @@ class TDTestCase:
         tdSql.checkData(0,2,14042.142857143)
         tdSql.checkData(0,3,26.785714286)
         tdSql.checkData(0,4,2.9142856660228804e+37)
-        # tdSql.checkData(0,5,None)
+        tdSql.checkData(0,5,None)