QUERY PLAN
GroupAggregate (cost=58.68..58.83 rows=8 width=12)
Group Key: parent_id
-> Sort (cost=58.68..58.71 rows=9 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..58.54 rows=9 width=4)
Filter: (parent_id = ANY ('{1732,1800,1804,1805,1806,1807,1808,1809,1812}'::integer[]))