QUERY PLAN
GroupAggregate (cost=61.85..62.03 rows=9 width=12)
Group Key: parent_id
-> Sort (cost=61.85..61.88 rows=11 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..61.66 rows=11 width=4)
Filter: (parent_id = ANY ('{1714,1716,1717,1732,1800,1804,1805,1806,1807,1808,1809}'::integer[]))