QUERY PLAN
GroupAggregate (cost=151.54..151.60 rows=3 width=12)
Group Key: parent_id
-> Sort (cost=151.54..151.55 rows=4 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..151.50 rows=4 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1590,1573,1569}'::integer[])))