QUERY PLAN
GroupAggregate (cost=52.32..52.37 rows=3 width=12)
Group Key: parent_id
-> Sort (cost=52.32..52.33 rows=3 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..52.30 rows=3 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1794,1795,1796}'::integer[])))