TD-6129<feature> support null true false for json tag

src/tsdb/src/tsdbRead.c

@@ -4089,7 +4089,7 @@ static FORCE_INLINE int32_t tsdbGetJsonTagDataFromId(void *param, int32_t id, ch
   } else {
     int16_t colId = 0;
     void* jsonData = getJsonTagValue(pTable, name, TSDB_MAX_JSON_KEY_MD5_LEN, &colId);
-    if(colId == id + 2){      // if find json tag is NULL
+    if(colId == id + 1){      // if find json tag is NULL
       if(jsonData != NULL) *data = NULL;
       else *data = pTable;
       return TSDB_CODE_SUCCESS;