QUERY PLAN
GroupAggregate (cost=58.71..58.87 rows=9 width=12)
Group Key: parent_id
-> Sort (cost=58.71..58.73 rows=10 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..58.54 rows=10 width=4)
Filter: (parent_id = ANY ('{1697,1723,1734,1735,1745,1746,1751,1754,1768}'::integer[]))