QUERY PLAN
GroupAggregate (cost=53.33..53.40 rows=4 width=12)
Group Key: parent_id
-> Sort (cost=53.33..53.34 rows=4 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..53.29 rows=4 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1658,1664,1666,1667,1668}'::integer[])))