QUERY PLAN
GroupAggregate (cost=50.95..51.14 rows=10 width=12)
Group Key: parent_id
-> Sort (cost=50.95..50.98 rows=12 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..50.73 rows=12 width=4)
Filter: ((parent_id = ANY ('{1713,1792}'::integer[])) AND (status = 1))