QUERY PLAN
GroupAggregate (cost=122.62..123.06 rows=24 width=12)
Group Key: remain_task.task_group_id
-> Sort (cost=122.62..122.69 rows=27 width=4)
Sort Key: remain_task.task_group_id
-> Hash Anti Join (cost=59.12..121.98 rows=27 width=4)
Hash Cond: (remain_task.id = child_task.parent_id)
-> Seq Scan on tbl_tasks remain_task (cost=0.00..62.25 rows=28 width=8)
Filter: ((status <> 1) AND (task_group_id = ANY ('{106,203,139,94,90,88,89,87,83,85}'::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)