QUERY PLAN
GroupAggregate (cost=49.76..49.81 rows=3 width=12)
Group Key: parent_id
-> Sort (cost=49.76..49.77 rows=3 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..49.74 rows=3 width=4)
Filter: (parent_id = ANY ('{1686,1745,1668}'::integer[]))