diff --git a/src/client/src/tscSql.c b/src/client/src/tscSql.c
index 37482389f81bfba3734a36ac00752f612eae9b30..672d385cc5cb88c5227e0035934abcbf0b99a376 100644
--- a/src/client/src/tscSql.c
+++ b/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;
diff --git a/src/client/src/tscUtil.c b/src/client/src/tscUtil.c
index a56367a98dd0a38628e9dca757dbaa087cd174d9..35c2c913d9b29a054b97eae8d3d7eb9bc1c8decc 100644
--- a/src/client/src/tscUtil.c
+++ b/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);