QUERY PLAN
GroupAggregate (cost=57.35..57.52 rows=9 width=12)
Group Key: parent_id
-> Sort (cost=57.35..57.38 rows=11 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..57.16 rows=11 width=4)
Filter: (parent_id = ANY ('{1566,1576,1577,1578,1596,1668,1686,1734}'::integer[]))