QUERY PLAN
GroupAggregate (cost=55.77..55.92 rows=8 width=12)
Group Key: parent_id
-> Sort (cost=55.77..55.79 rows=9 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..55.62 rows=9 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1596,1734,1747,1746,1727}'::integer[])))