QUERY PLAN
GroupAggregate (cost=60.50..60.67 rows=9 width=12)
Group Key: parent_id
-> Sort (cost=60.50..60.52 rows=11 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..60.30 rows=11 width=4)
Filter: (parent_id = ANY ('{1781,1780,1772,1754,1751,1746,1735,1734,1697,1696}'::integer[]))