QUERY PLAN
GroupAggregate (cost=61.22..61.39 rows=9 width=12)
Group Key: parent_id
-> Sort (cost=61.22..61.24 rows=11 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..61.02 rows=11 width=4)
Filter: (parent_id = ANY ('{1576,1577,1578,1596,1668,1686,1734,1745,1768,1776}'::integer[]))