QUERY PLAN
GroupAggregate (cost=118.37..118.46 rows=5 width=12)
Group Key: remain_task.task_group_id
-> Sort (cost=118.37..118.38 rows=5 width=4)
Sort Key: remain_task.task_group_id
-> Hash Anti Join (cost=59.12..118.31 rows=5 width=4)
Hash Cond: (remain_task.id = child_task.parent_id)
-> Seq Scan on tbl_tasks remain_task (cost=0.00..59.12 rows=5 width=8)
Filter: ((status <> 1) AND (task_group_id = ANY ('{207,206,205,203,201,189,188,187}'::integer[])))
-> Hash (cost=43.50..43.50 rows=1250 width=4)
-> Seq Scan on tbl_tasks child_task (cost=0.00..43.50 rows=1250 width=4)