QUERY PLAN
GroupAggregate (cost=54.09..54.16 rows=4 width=12)
Group Key: parent_id
-> Sort (cost=54.09..54.10 rows=4 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..54.05 rows=4 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1707,1704,1706,1705}'::integer[])))