QUERY PLAN
GroupAggregate (cost=53.02..53.11 rows=5 width=12)
Group Key: parent_id
-> Sort (cost=53.02..53.03 rows=5 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..52.96 rows=5 width=4)
Filter: (parent_id = ANY ('{1732,1717,1716,1715,1714}'::integer[]))