QUERY PLAN
GroupAggregate (cost=125.80..126.07 rows=15 width=12)
Group Key: remain_task.task_group_id
-> Sort (cost=125.80..125.84 rows=16 width=4)
Sort Key: remain_task.task_group_id
-> Hash Anti Join (cost=61.02..125.48 rows=16 width=4)
Hash Cond: (remain_task.id = child_task.parent_id)
-> Seq Scan on tbl_tasks remain_task (cost=0.00..64.25 rows=16 width=8)
Filter: ((status <> 1) AND (task_group_id = ANY ('{209,208,139,106,96,94,90,89,88,87}'::integer[])))
-> Hash (cost=44.90..44.90 rows=1290 width=4)
-> Seq Scan on tbl_tasks child_task (cost=0.00..44.90 rows=1290 width=4)