SELECT pgroonga_result_to_jsonb_objects(
  '{
     "header": {
       "return_code": 0,
       "start_time": 0.0,
       "elapsed_time": 0.0
     },
     "body": {
       "n_hits": 0,
       "columns": [
         {
           "name": "_id",
           "type": "UInt32"
         }
       ],
       "records": [
       ]
     }
   }'::jsonb);
