QUERY PLAN
GroupAggregate (cost=123.01..123.11 rows=6 width=12)
Group Key: remain_task.task_group_id
-> Sort (cost=123.01..123.02 rows=6 width=4)
Sort Key: remain_task.task_group_id
-> Hash Anti Join (cost=59.88..122.93 rows=6 width=4)
Hash Cond: (remain_task.id = child_task.parent_id)
-> Seq Scan on tbl_tasks remain_task (cost=0.00..62.98 rows=6 width=8)
Filter: ((status <> 1) AND (task_group_id = ANY ('{207,206,205,203,202,201,200,199,198,197}'::integer[])))
-> Hash (cost=44.39..44.39 rows=1239 width=4)
-> Seq Scan on tbl_tasks child_task (cost=0.00..44.39 rows=1239 width=4)