QUERY PLAN
GroupAggregate (cost=123.51..123.64 rows=7 width=12)
Group Key: remain_task.task_group_id
-> Sort (cost=123.51..123.53 rows=7 width=4)
Sort Key: remain_task.task_group_id
-> Hash Anti Join (cost=60.10..123.42 rows=7 width=4)
Hash Cond: (remain_task.id = child_task.parent_id)
-> Seq Scan on tbl_tasks remain_task (cost=0.00..63.23 rows=7 width=8)
Filter: ((status <> 1) AND (task_group_id = ANY ('{207,206,205,203,202,201,200,199,198,197}'::integer[])))
-> Hash (cost=44.49..44.49 rows=1249 width=4)
-> Seq Scan on tbl_tasks child_task (cost=0.00..44.49 rows=1249 width=4)