QUERY PLAN
GroupAggregate (cost=55.69..55.80 rows=6 width=12)
Group Key: parent_id
-> Sort (cost=55.69..55.70 rows=7 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..55.59 rows=7 width=4)
Filter: (parent_id = ANY ('{1732,1800,1804,1805,1807,1808,1809}'::integer[]))