QUERY PLAN
GroupAggregate (cost=61.88..62.07 rows=10 width=12)
Group Key: parent_id
-> Sort (cost=61.88..61.91 rows=12 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..61.66 rows=12 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1576,1577,1578,1596,1668,1686,1734,1745,1768}'::integer[])))