QUERY PLAN
GroupAggregate (cost=57.10..57.23 rows=7 width=12)
Group Key: parent_id
-> Sort (cost=57.10..57.12 rows=8 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..56.98 rows=8 width=4)
Filter: (parent_id = ANY ('{1732,1789,1788,1787,1786,1714,1717,1716}'::integer[]))