QUERY PLAN
GroupAggregate (cost=49.42..49.55 rows=7 width=12)
Group Key: parent_id
-> Sort (cost=49.42..49.44 rows=8 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..49.30 rows=8 width=4)
Filter: (parent_id = ANY ('{1713,1791,1792}'::integer[]))