QUERY PLAN
GroupAggregate (cost=60.92..61.08 rows=8 width=12)
Group Key: parent_id
-> Sort (cost=60.92..60.94 rows=11 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..60.73 rows=11 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1647,1672,1669,1668,1667,1662,1661,1580,1578,1577}'::integer[])))