QUERY PLAN
GroupAggregate (cost=58.88..59.02 rows=8 width=12)
Group Key: parent_id
-> Sort (cost=58.88..58.90 rows=9 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..58.73 rows=9 width=4)
Filter: (parent_id = ANY ('{1732,1800,1804,1805,1806,1807,1808,1809,1812}'::integer[]))