QUERY PLAN
GroupAggregate (cost=47.93..48.00 rows=4 width=12)
Group Key: parent_id
-> Sort (cost=47.93..47.94 rows=4 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..47.89 rows=4 width=4)
Filter: (parent_id = ANY ('{1731,1713}'::integer[]))