QUERY PLAN
GroupAggregate (cost=52.50..52.59 rows=5 width=12)
Group Key: parent_id
-> Sort (cost=52.50..52.51 rows=5 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..52.44 rows=5 width=4)
Filter: (parent_id = ANY ('{1714,1716,1717,1732,1800}'::integer[]))