QUERY PLAN
GroupAggregate (cost=52.59..52.73 rows=8 width=12)
Group Key: parent_id
-> Sort (cost=52.59..52.61 rows=9 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..52.44 rows=9 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1713,1810,1811}'::integer[])))