QUERY PLAN
GroupAggregate (cost=161.66..161.68 rows=1 width=12)
Group Key: task_group_id
-> Sort (cost=161.66..161.66 rows=1 width=4)
Sort Key: task_group_id
-> Seq Scan on tbl_tasks (cost=0.00..161.65 rows=1 width=4)
Filter: ((parent_id IS NULL) AND (status = 0) AND (task_group_id = ANY ('{203,202,201,200,199,198,197,196,195,194}'::integer[])))