QUERY PLAN
GroupAggregate (cost=60.83..61.17 rows=17 width=12)
Group Key: parent_id
-> Sort (cost=60.83..60.88 rows=23 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..60.30 rows=23 width=4)
Filter: (parent_id = ANY ('{1696,1687,1684,1683,1671,1670,1647,1641,1596,1426}'::integer[]))