QUERY PLAN
GroupAggregate (cost=57.80..58.06 rows=13 width=12)
Group Key: parent_id
-> Sort (cost=57.80..57.84 rows=18 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..57.42 rows=18 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1596,1641,1647,1697,1696,1687}'::integer[])))