QUERY PLAN
GroupAggregate (cost=47.87..48.02 rows=8 width=12)
Group Key: parent_id
-> Sort (cost=47.87..47.89 rows=9 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..47.73 rows=9 width=4)
Filter: (parent_id = ANY ('{1713,1810}'::integer[]))