QUERY PLAN
GroupAggregate (cost=57.43..57.65 rows=12 width=12)
Group Key: parent_id
-> Sort (cost=57.43..57.46 rows=14 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..57.16 rows=14 width=4)
Filter: (parent_id = ANY ('{1347,1349,1356,1358,1596,1734,1823,1830}'::integer[]))