QUERY PLAN
GroupAggregate (cost=71.37..71.59 rows=12 width=12)
Group Key: task_group_id
-> Sort (cost=71.37..71.40 rows=13 width=4)
Sort Key: task_group_id
-> Seq Scan on tbl_tasks (cost=0.00..71.13 rows=13 width=4)
Filter: ((parent_id IS NULL) AND (status = 0) AND (task_group_id = ANY ('{203,200,199,198,197,196,192,178,106,90,88,87,85,83,79,78,74}'::integer[])))