QUERY PLAN
GroupAggregate (cost=108.02..108.11 rows=5 width=12)
Group Key: remain_task.task_group_id
-> Sort (cost=108.02..108.03 rows=5 width=4)
Sort Key: remain_task.task_group_id
-> Hash Anti Join (cost=58.54..107.96 rows=5 width=4)
Hash Cond: (remain_task.id = child_task.parent_id)
-> Seq Scan on tbl_tasks remain_task (cost=0.00..49.36 rows=5 width=8)
Filter: ((status <> 1) AND (task_group_id = ANY ('{106,86}'::integer[])))
-> Hash (cost=43.24..43.24 rows=1224 width=4)
-> Seq Scan on tbl_tasks child_task (cost=0.00..43.24 rows=1224 width=4)