fix(query): set correct json tag.

source/libs/executor/src/scanoperator.c

@@ -408,8 +408,12 @@ int32_t addTagPseudoColumnData(SReadHandle* pHandle, SExprInfo* pPseudoExpr, int
       bool isNullVal = (data == NULL) || (pColInfoData->info.type == TSDB_DATA_TYPE_JSON && tTagIsJsonNull(data));
       if (isNullVal) {
         colDataAppendNNULL(pColInfoData, 0, pBlock->info.rows);
-      } else {
+      } else if (pColInfoData->info.type != TSDB_DATA_TYPE_JSON) {
         colDataAppendNItems(pColInfoData, 0, data, pBlock->info.rows);
+      } else { // todo opt for json tag
+        for (int32_t i = 0; i < pBlock->info.rows; ++i) {
+          colDataAppend(pColInfoData, i, data, false));
+        }
       }
 
       if (data && (pColInfoData->info.type != TSDB_DATA_TYPE_JSON) && p != NULL &&