QUERY PLAN
GroupAggregate (cost=60.62..60.88 rows=13 width=12)
Group Key: parent_id
-> Sort (cost=60.62..60.66 rows=16 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..60.30 rows=16 width=4)
Filter: (parent_id = ANY ('{1347,1348,1349,1356,1358,1596,1734,1823,1824,1830}'::integer[]))