QUERY PLAN
GroupAggregate (cost=177.27..177.50 rows=13 width=12)
Group Key: task_group_id
-> Sort (cost=177.27..177.30 rows=14 width=4)
Sort Key: task_group_id
-> Seq Scan on tbl_tasks (cost=0.00..177.00 rows=14 width=4)
Filter: ((parent_id IS NULL) AND (status = 0) AND (task_group_id = ANY ('{214,201,200,199,198,197,196,195,189,188,187,94,90,88,87,85,83,79,78,74}'::integer[])))