QUERY PLAN
GroupAggregate (cost=49.85..49.96 rows=6 width=12)
Group Key: parent_id
-> Sort (cost=49.85..49.87 rows=7 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..49.75 rows=7 width=4)
Filter: (parent_id = ANY ('{1731,1713,1712,1711}'::integer[]))