QUERY PLAN
GroupAggregate (cost=51.06..51.23 rows=9 width=12)
Group Key: parent_id
-> Sort (cost=51.06..51.09 rows=11 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..50.87 rows=11 width=4)
Filter: (parent_id = ANY ('{1713,1777,1810,1811}'::integer[]))