QUERY PLAN
GroupAggregate (cost=59.62..59.94 rows=16 width=12)
Group Key: parent_id
-> Sort (cost=59.62..59.67 rows=22 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..59.12 rows=22 width=4)
Filter: (parent_id = ANY ('{1596,1647,1734,1737,1727,58,63,76,67,64}'::integer[]))