QUERY PLAN
GroupAggregate (cost=69.60..69.87 rows=15 width=12)
Group Key: task_group_id
-> Sort (cost=69.60..69.64 rows=17 width=4)
Sort Key: task_group_id
-> Seq Scan on tbl_tasks (cost=0.00..69.25 rows=17 width=4)
Filter: ((parent_id IS NULL) AND (status = 0) AND (task_group_id = ANY ('{203,202,201,189,188,187,94,90,88,87,85,83,79,78,74}'::integer[])))