QUERY PLAN
GroupAggregate (cost=58.02..58.21 rows=9 width=12)
Group Key: parent_id
-> Sort (cost=58.02..58.05 rows=14 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..57.75 rows=14 width=4)
Filter: (parent_id = ANY ('{1596,1641,1647,1652,1347,1358,1359,1349,1350,1357}'::integer[]))