QUERY PLAN
GroupAggregate (cost=63.99..64.17 rows=9 width=12)
Group Key: parent_id
-> Sort (cost=63.99..64.02 rows=12 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..63.78 rows=12 width=4)
Filter: (parent_id = ANY ('{1688,1702,1701,1694,1693,1692,1691,1690,1689,1651,1650,1648}'::integer[]))