QUERY PLAN
GroupAggregate (cost=50.91..50.98 rows=4 width=12)
Group Key: parent_id
-> Sort (cost=50.91..50.92 rows=4 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..50.87 rows=4 width=4)
Filter: (parent_id = ANY ('{1732,1793,1789,1788}'::integer[]))