QUERY PLAN
GroupAggregate (cost=58.90..59.06 rows=9 width=12)
Group Key: parent_id
-> Sort (cost=58.90..58.92 rows=10 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..58.73 rows=10 width=4)
Filter: (parent_id = ANY ('{1697,1734,1735,1746,1751,1754,1768,1769,1772}'::integer[]))