QUERY PLAN
GroupAggregate (cost=55.74..55.88 rows=7 width=12)
Group Key: parent_id
-> Sort (cost=55.74..55.77 rows=8 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..55.62 rows=8 width=4)
Filter: (parent_id = ANY ('{1753,1727,1724,1726,1725,1720,1719}'::integer[]))