QUERY PLAN
GroupAggregate (cost=62.47..62.66 rows=10 width=12)
Group Key: parent_id
-> Sort (cost=62.47..62.50 rows=12 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..62.25 rows=12 width=4)
Filter: (parent_id = ANY ('{1648,1650,1651,1688,1689,1690,1691,1692,1693,1694,1701,1702}'::integer[]))