QUERY PLAN
GroupAggregate (cost=63.59..63.74 rows=8 width=12)
Group Key: parent_id
-> Sort (cost=63.59..63.62 rows=9 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..63.45 rows=9 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{387,388,392,404,421,438,524,525,526,529}'::integer[])))