change json output format

src/client/src/tscLocal.c

@@ -215,7 +215,7 @@ static int32_t tscProcessDescribeTable(SSqlObj *pSql) {
   return tscSetValueToResObj(pSql, rowLen);
 }
 static int32_t tscGetNthFieldResult(TAOS_ROW row, TAOS_FIELD* fields, int *lengths, int idx, char *result) {
-  const char *val = (const char*)row[idx];
+  char *val = (char*)row[idx];
   if (val == NULL) {
     sprintf(result, "%s", TSDB_DATA_NULL_STR);
     return -1;
@@ -223,6 +223,16 @@ static int32_t tscGetNthFieldResult(TAOS_ROW row, TAOS_FIELD* fields, int *lengt
   uint8_t type = fields[idx].type;
   int32_t length = lengths[idx]; 
 
+  if (type == TSDB_DATA_TYPE_JSON){
+    char* p = result;
+    type = *p;
+    val += CHAR_BYTES;
+    if(type == TSDB_DATA_TYPE_NCHAR) {
+      length = varDataLen(val);
+      val = varDataVal(val);
+    }
+  }
+
   switch (type) {
     case TSDB_DATA_TYPE_BOOL: 
       sprintf(result, "%s", ((((int32_t)(*((char *)val))) == 1) ? "true" : "false"));