diff --git a/include/common/tdatablock.h b/include/common/tdatablock.h
index fa203e231a938b1a9be04207adec90ed74442154..a354605a2195ba11b0cfe4f8f0b0a49f189fde01 100644
--- a/include/common/tdatablock.h
+++ b/include/common/tdatablock.h
@@ -74,8 +74,8 @@ static FORCE_INLINE bool colDataIsNull_s(const SColumnInfoData* pColumnInfoData,
     }
     char *data = colDataGetVarData(pColumnInfoData, row);
     return (*data == TSDB_DATA_TYPE_NULL);
-  } 
-  
+  }
+
   if (!pColumnInfoData->hasNull) {
     return false;
   }
diff --git a/source/libs/function/src/builtins.c b/source/libs/function/src/builtins.c
index 3da5dc3289e246d6202c984bbc64f40eecde2832..76ccbe5412a4e24dbc1c00aaa3ec8fd9f01ab15f 100644
--- a/source/libs/function/src/builtins.c
+++ b/source/libs/function/src/builtins.c
@@ -355,7 +355,7 @@ static int32_t translateToIso8601(SFunctionNode* pFunc, char* pErrBuf, int32_t l
     return invaildFuncParaTypeErrMsg(pErrBuf, len, pFunc->functionName);
   }
 
-  pFunc->node.resType = (SDataType) { .bytes = 64, .type = TSDB_DATA_TYPE_BINARY};
+  pFunc->node.resType = (SDataType) { .bytes = 24, .type = TSDB_DATA_TYPE_BINARY};
   return TSDB_CODE_SUCCESS;
 }
 
diff --git a/source/libs/scalar/src/sclfunc.c b/source/libs/scalar/src/sclfunc.c
index cca7f1cbffd2f967b491f848c0f41a48d97bf3c3..33ddab8d2447a0135b082dc60c42ca161198e37b 100644
--- a/source/libs/scalar/src/sclfunc.c
+++ b/source/libs/scalar/src/sclfunc.c
@@ -32,8 +32,8 @@ int32_t absFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOutpu
       float *in  = (float *)pInputData->pData;
       float *out = (float *)pOutputData->pData;
       for (int32_t i = 0; i < pInput->numOfRows; ++i) {
-        if (colDataIsNull_f(pInputData->nullbitmap, i)) {
-          colDataSetNull_f(pOutputData->nullbitmap, i);
+        if (colDataIsNull_s(pInputData, i)) {
+          colDataAppendNULL(pOutputData, i);
           continue;
         }
         out[i] = (in[i] >= 0)? in[i] : -in[i];
@@ -45,8 +45,8 @@ int32_t absFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOutpu
       double *in  = (double *)pInputData->pData;
       double *out = (double *)pOutputData->pData;
       for (int32_t i = 0; i < pInput->numOfRows; ++i) {
-        if (colDataIsNull_f(pInputData->nullbitmap, i)) {
-          colDataSetNull_f(pOutputData->nullbitmap, i);
+        if (colDataIsNull_s(pInputData, i)) {
+          colDataAppendNULL(pOutputData, i);
           continue;
         }
         out[i] = (in[i] >= 0)? in[i] : -in[i];
@@ -58,8 +58,8 @@ int32_t absFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOutpu
       int8_t *in  = (int8_t *)pInputData->pData;
       int8_t *out = (int8_t *)pOutputData->pData;
       for (int32_t i = 0; i < pInput->numOfRows; ++i) {
-        if (colDataIsNull_f(pInputData->nullbitmap, i)) {
-          colDataSetNull_f(pOutputData->nullbitmap, i);
+        if (colDataIsNull_s(pInputData, i)) {
+          colDataAppendNULL(pOutputData, i);
           continue;
         }
         out[i] = (in[i] >= 0)? in[i] : -in[i];
@@ -71,8 +71,8 @@ int32_t absFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOutpu
       int16_t *in  = (int16_t *)pInputData->pData;
       int16_t *out = (int16_t *)pOutputData->pData;
       for (int32_t i = 0; i < pInput->numOfRows; ++i) {
-        if (colDataIsNull_f(pInputData->nullbitmap, i)) {
-          colDataSetNull_f(pOutputData->nullbitmap, i);
+        if (colDataIsNull_s(pInputData, i)) {
+          colDataAppendNULL(pOutputData, i);
           continue;
         }
         out[i] = (in[i] >= 0)? in[i] : -in[i];
@@ -84,8 +84,8 @@ int32_t absFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOutpu
       int32_t *in  = (int32_t *)pInputData->pData;
       int32_t *out = (int32_t *)pOutputData->pData;
       for (int32_t i = 0; i < pInput->numOfRows; ++i) {
-        if (colDataIsNull_f(pInputData->nullbitmap, i)) {
-          colDataSetNull_f(pOutputData->nullbitmap, i);
+        if (colDataIsNull_s(pInputData, i)) {
+          colDataAppendNULL(pOutputData, i);
           continue;
         }
         out[i] = (in[i] >= 0)? in[i] : -in[i];
@@ -97,8 +97,8 @@ int32_t absFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOutpu
       int64_t *in  = (int64_t *)pInputData->pData;
       int64_t *out = (int64_t *)pOutputData->pData;
       for (int32_t i = 0; i < pInput->numOfRows; ++i) {
-        if (colDataIsNull_f(pInputData->nullbitmap, i)) {
-          colDataSetNull_f(pOutputData->nullbitmap, i);
+        if (colDataIsNull_s(pInputData, i)) {
+          colDataAppendNULL(pOutputData, i);
           continue;
         }
         out[i] = (in[i] >= 0)? in[i] : -in[i];
@@ -129,8 +129,8 @@ static int32_t doScalarFunctionUnique(SScalarParam *pInput, int32_t inputNum, SS
   double *out = (double *)pOutputData->pData;
 
   for (int32_t i = 0; i < pInput->numOfRows; ++i) {
-    if (colDataIsNull_f(pInputData->nullbitmap, i)) {
-      colDataSetNull_f(pOutputData->nullbitmap, i);
+    if (colDataIsNull_s(pInputData, i)) {
+      colDataAppendNULL(pOutputData, i);
       continue;
     }
     out[i] = valFn(getValueFn(pInputData->pData, i));
@@ -157,9 +157,9 @@ static int32_t doScalarFunctionUnique2(SScalarParam *pInput, int32_t inputNum, S
   double *out = (double *)pOutputData->pData;
 
   for (int32_t i = 0; i < pInput->numOfRows; ++i) {
-    if (colDataIsNull_f(pInputData[0]->nullbitmap, i) ||
-        colDataIsNull_f(pInputData[1]->nullbitmap, 0)) {
-      colDataSetNull_f(pOutputData->nullbitmap, i);
+    if (colDataIsNull_s(pInputData[0], i) ||
+        colDataIsNull_s(pInputData[1], 0)) {
+      colDataAppendNULL(pOutputData, i);
       continue;
     }
     out[i] = valFn(getValueFn[0](pInputData[0]->pData, i), getValueFn[1](pInputData[1]->pData, 0));
@@ -184,8 +184,8 @@ static int32_t doScalarFunction(SScalarParam *pInput, int32_t inputNum, SScalarP
       float *out = (float *)pOutputData->pData;
 
       for (int32_t i = 0; i < pInput->numOfRows; ++i) {
-        if (colDataIsNull_f(pInputData->nullbitmap, i)) {
-          colDataSetNull_f(pOutputData->nullbitmap, i);
+        if (colDataIsNull_s(pInputData, i)) {
+          colDataAppendNULL(pOutputData, i);
           continue;
         }
         out[i] = f1(in[i]);
@@ -198,8 +198,8 @@ static int32_t doScalarFunction(SScalarParam *pInput, int32_t inputNum, SScalarP
       double *out = (double *)pOutputData->pData;
 
       for (int32_t i = 0; i < pInput->numOfRows; ++i) {
-        if (colDataIsNull_f(pInputData->nullbitmap, i)) {
-          colDataSetNull_f(pOutputData->nullbitmap, i);
+        if (colDataIsNull_s(pInputData, i)) {
+          colDataAppendNULL(pOutputData, i);
           continue;
         }
         out[i] = d1(in[i]);
@@ -301,7 +301,7 @@ static int32_t doLengthFunction(SScalarParam *pInput, int32_t inputNum, SScalarP
 
   for (int32_t i = 0; i < pInput->numOfRows; ++i) {
     if (colDataIsNull_s(pInputData, i)) {
-      colDataSetNull_f(pOutputData->nullbitmap, i);
+      colDataAppendNULL(pOutputData, i);
       continue;
     }