QUERY PLAN
GroupAggregate (cost=52.99..53.04 rows=3 width=12)
Group Key: parent_id
-> Sort (cost=52.99..52.99 rows=3 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..52.96 rows=3 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1686,1745,1668}'::integer[])))