QUERY PLAN
GroupAggregate (cost=154.62..154.76 rows=8 width=12)
Group Key: task_group_id
-> Sort (cost=154.62..154.64 rows=8 width=4)
Sort Key: task_group_id
-> Seq Scan on tbl_tasks (cost=0.00..154.50 rows=8 width=4)
Filter: ((parent_id IS NULL) AND (status = 0) AND (task_group_id = ANY ('{94,90,87,83,79}'::integer[])))