QUERY PLAN
GroupAggregate (cost=57.20..57.39 rows=10 width=12)
Group Key: parent_id
-> Sort (cost=57.20..57.23 rows=12 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..56.98 rows=12 width=4)
Filter: (parent_id = ANY ('{1566,1576,1577,1578,1596,1668,1686,1734}'::integer[]))