QUERY PLAN
GroupAggregate (cost=112.87..112.94 rows=4 width=12)
Group Key: remain_task.task_group_id
-> Sort (cost=112.87..112.88 rows=4 width=4)
Sort Key: remain_task.task_group_id
-> Hash Anti Join (cost=58.70..112.83 rows=4 width=4)
Hash Cond: (remain_task.id = child_task.parent_id)
-> Seq Scan on tbl_tasks remain_task (cost=0.00..54.08 rows=4 width=8)
Filter: ((status <> 1) AND (task_group_id = ANY ('{203,201,189,188,187}'::integer[])))
-> Hash (cost=43.31..43.31 rows=1231 width=4)
-> Seq Scan on tbl_tasks child_task (cost=0.00..43.31 rows=1231 width=4)