QUERY PLAN
GroupAggregate (cost=49.44..49.66 rows=11 width=12)
Group Key: parent_id
-> Sort (cost=49.44..49.48 rows=14 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..49.17 rows=14 width=4)
Filter: (parent_id = ANY ('{1713,1792,1777}'::integer[]))