QUERY PLAN
GroupAggregate (cost=49.20..49.25 rows=3 width=12)
Group Key: parent_id
-> Sort (cost=49.20..49.21 rows=3 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..49.17 rows=3 width=4)
Filter: (parent_id = ANY ('{1794,1795,1796}'::integer[]))