QUERY PLAN
GroupAggregate (cost=60.73..60.77 rows=2 width=12)
Group Key: task_group_id
-> Sort (cost=60.73..60.74 rows=2 width=4)
Sort Key: task_group_id
-> Seq Scan on tbl_tasks (cost=0.00..60.73 rows=2 width=4)
Filter: ((parent_id IS NULL) AND (status = 0) AND (task_group_id = ANY ('{192,191,190,189,188,187,178,141,140,139}'::integer[])))