diff --git a/source/libs/executor/src/timesliceoperator.c b/source/libs/executor/src/timesliceoperator.c
index cb74392a10..b019985645 100644
--- a/source/libs/executor/src/timesliceoperator.c
+++ b/source/libs/executor/src/timesliceoperator.c
@@ -312,6 +312,7 @@ static bool genInterpolationResult(STimeSliceOperatorInfo* pSliceInfo, SExprSupp
       case TSDB_FILL_SET_VALUE_F: {
         SVariant* pVar = &pSliceInfo->pFillColInfo[fillColIndex].fillVal;
 
+        bool isNull = (TSDB_DATA_TYPE_NULL == pVar->nType) ? true : false;
         if (pDst->info.type == TSDB_DATA_TYPE_FLOAT) {
           float v = 0;
           if (!IS_VAR_DATA_TYPE(pVar->nType)) {
@@ -319,7 +320,7 @@ static bool genInterpolationResult(STimeSliceOperatorInfo* pSliceInfo, SExprSupp
           } else {
             v = taosStr2Float(varDataVal(pVar->pz), NULL);
           }
-          colDataSetVal(pDst, rows, (char*)&v, false);
+          colDataSetVal(pDst, rows, (char*)&v, isNull);
         } else if (pDst->info.type == TSDB_DATA_TYPE_DOUBLE) {
           double v = 0;
           if (!IS_VAR_DATA_TYPE(pVar->nType)) {
@@ -327,7 +328,7 @@ static bool genInterpolationResult(STimeSliceOperatorInfo* pSliceInfo, SExprSupp
           } else {
             v = taosStr2Double(varDataVal(pVar->pz), NULL);
           }
-          colDataSetVal(pDst, rows, (char*)&v, false);
+          colDataSetVal(pDst, rows, (char*)&v, isNull);
         } else if (IS_SIGNED_NUMERIC_TYPE(pDst->info.type)) {
           int64_t v = 0;
           if (!IS_VAR_DATA_TYPE(pVar->nType)) {
@@ -335,7 +336,7 @@ static bool genInterpolationResult(STimeSliceOperatorInfo* pSliceInfo, SExprSupp
           } else {
             v = taosStr2Int64(varDataVal(pVar->pz), NULL, 10);
           }
-          colDataSetVal(pDst, rows, (char*)&v, false);
+          colDataSetVal(pDst, rows, (char*)&v, isNull);
         } else if (IS_UNSIGNED_NUMERIC_TYPE(pDst->info.type)) {
           uint64_t v = 0;
           if (!IS_VAR_DATA_TYPE(pVar->nType)) {
@@ -343,7 +344,7 @@ static bool genInterpolationResult(STimeSliceOperatorInfo* pSliceInfo, SExprSupp
           } else {
             v = taosStr2UInt64(varDataVal(pVar->pz), NULL, 10);
           }
-          colDataSetVal(pDst, rows, (char*)&v, false);
+          colDataSetVal(pDst, rows, (char*)&v, isNull);
         } else if (IS_BOOLEAN_TYPE(pDst->info.type)) {
           bool v = false;
           if (!IS_VAR_DATA_TYPE(pVar->nType)) {
@@ -351,7 +352,7 @@ static bool genInterpolationResult(STimeSliceOperatorInfo* pSliceInfo, SExprSupp
           } else {
             v = taosStr2Int8(varDataVal(pVar->pz), NULL, 10);
           }
-          colDataSetVal(pDst, rows, (char*)&v, false);
+          colDataSetVal(pDst, rows, (char*)&v, isNull);
         }
 
         ++fillColIndex;