-
  id: 1
  task_id: 49
  output_key: output_a
  output_value: abc
-
  id: 2
  task_id: 49
  output_key: output_b
  output_value: ''
-
  id: 3
  task_id: 50
  output_key: output_a
  output_value: ''
-
  id: 4
  task_id: 50
  output_key: output_b
  output_value: bbb