QUERY PLAN
GroupAggregate (cost=60.77..61.08 rows=16 width=12)
Group Key: parent_id
-> Sort (cost=60.77..60.82 rows=21 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..60.30 rows=21 width=4)
Filter: (parent_id = ANY ('{1772,1769,1754,1746,1751,1647,1735,1723,1641,1696}'::integer[]))