QUERY PLAN
GroupAggregate (cost=50.92..50.98 rows=3 width=12)
Group Key: parent_id
-> Sort (cost=50.92..50.93 rows=3 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..50.90 rows=3 width=4)
Filter: ((parent_id = ANY ('{1535,1667}'::integer[])) AND (status = 1))