fix fill(value, string) issue

source/libs/executor/src/timesliceoperator.c

@@ -271,15 +271,27 @@ static bool genInterpolationResult(STimeSliceOperatorInfo* pSliceInfo, SExprSupp
 
         if (pDst->info.type == TSDB_DATA_TYPE_FLOAT) {
           float v = 0;
-          GET_TYPED_DATA(v, float, pVar->nType, &pVar->i);
+          if (!IS_VAR_DATA_TYPE(pVar->nType)) {
+            GET_TYPED_DATA(v, float, pVar->nType, &pVar->i);
+          } else {
+            v = taosStr2Float(varDataVal(pVar->pz), NULL);
+          }
           colDataSetVal(pDst, rows, (char*)&v, false);
         } else if (pDst->info.type == TSDB_DATA_TYPE_DOUBLE) {
           double v = 0;
-          GET_TYPED_DATA(v, double, pVar->nType, &pVar->i);
+          if (!IS_VAR_DATA_TYPE(pVar->nType)) {
+            GET_TYPED_DATA(v, double, pVar->nType, &pVar->i);
+          } else {
+            v = taosStr2Double(varDataVal(pVar->pz), NULL);
+          }
           colDataSetVal(pDst, rows, (char*)&v, false);
         } else if (IS_SIGNED_NUMERIC_TYPE(pDst->info.type)) {
           int64_t v = 0;
-          GET_TYPED_DATA(v, int64_t, pVar->nType, &pVar->i);
+          if (!IS_VAR_DATA_TYPE(pVar->nType)) {
+            GET_TYPED_DATA(v, int64_t, pVar->nType, &pVar->i);
+          } else {
+            v = taosStr2int64(varDataVal(pVar->pz));
+          }
           colDataSetVal(pDst, rows, (char*)&v, false);
         } else if (IS_BOOLEAN_TYPE(pDst->info.type)) {
           bool v = false;