fix group by json tag format [change json type with qid return logic]

src/client/src/tscSql.c

@@ -439,7 +439,7 @@ TAOS_FIELD *taos_fetch_fields(TAOS_RES *res) {
       if (pField->visible) {
         f[j] = pField->field;
 
-        if(f[j].type == TSDB_DATA_TYPE_JSON){
+        if(f[j].type == TSDB_DATA_TYPE_JSON && pField->fieldJson.type != TSDB_DATA_TYPE_NULL){
           f[j].type = pField->fieldJson.type;
           if(!IS_VAR_DATA_TYPE(f[j].type) && f[j].type != TSDB_DATA_TYPE_JSON){
             f[j].bytes = pField->fieldJson.bytes;

src/client/src/tscUtil.c

@@ -2265,7 +2265,7 @@ SInternalField* tscFieldInfoAppend(SFieldInfo* pFieldInfo, TAOS_FIELD* pField) {
   assert(pFieldInfo != NULL);
   pFieldInfo->numOfOutput++;
 
-  struct SInternalField info = { .pExpr = NULL, .visible = true, .fieldJson={0} };
+  struct SInternalField info = { .pExpr = NULL, .visible = true };
 
   info.field = *pField;
   return taosArrayPush(pFieldInfo->internalField, &info);
@@ -2273,7 +2273,7 @@ SInternalField* tscFieldInfoAppend(SFieldInfo* pFieldInfo, TAOS_FIELD* pField) {
 
 SInternalField* tscFieldInfoInsert(SFieldInfo* pFieldInfo, int32_t index, TAOS_FIELD* field) {
   pFieldInfo->numOfOutput++;
-  struct SInternalField info = { .pExpr = NULL, .visible = true, .fieldJson={0}};
+  struct SInternalField info = { .pExpr = NULL, .visible = true };
 
   info.field = *field;
   return taosArrayInsert(pFieldInfo->internalField, index, &info);

tests/pytest/stable/json_tag.py

@@ -194,7 +194,7 @@ class TDTestCase:
         tdSql.checkData(0, 0, "{\"k1\":\"\",\"k2\":true,\"k3\":false,\"k4\":55}")
 
         tdSql.query("select jtag->'k2' from db_json_tag_test.jsons1_10")
-        tdSql.checkData(0, 0, "true")
+        tdSql.checkData(0, 0, True)
 
         tdSql.query("select jtag from db_json_tag_test.jsons1 where jtag->'k1'=''")
         tdSql.checkRows(1)