QUERY PLAN
GroupAggregate (cost=116.07..116.14 rows=4 width=12)
Group Key: remain_task.task_group_id
-> Sort (cost=116.07..116.08 rows=4 width=4)
Sort Key: remain_task.task_group_id
-> Hash Anti Join (cost=60.35..116.03 rows=4 width=4)
Hash Cond: (remain_task.id = child_task.parent_id)
-> Seq Scan on tbl_tasks remain_task (cost=0.00..55.62 rows=4 width=8)
Filter: ((status <> 1) AND (task_group_id = ANY ('{203,201,189,188,187}'::integer[])))
-> Hash (cost=44.60..44.60 rows=1260 width=4)
-> Seq Scan on tbl_tasks child_task (cost=0.00..44.60 rows=1260 width=4)