QUERY PLAN
GroupAggregate (cost=61.55..61.88 rows=16 width=12)
Group Key: parent_id
-> Sort (cost=61.55..61.60 rows=23 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..61.02 rows=23 width=4)
Filter: (parent_id = ANY ('{1596,1647,1734,1742,1727,58,63,76,67,64}'::integer[]))