QUERY PLAN
GroupAggregate (cost=60.07..60.24 rows=9 width=12)
Group Key: parent_id
-> Sort (cost=60.07..60.10 rows=11 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..59.88 rows=11 width=4)
Filter: (parent_id = ANY ('{1596,1734,58,63,76,67,64,65,79,134}'::integer[]))