QUERY PLAN
GroupAggregate (cost=47.44..47.49 rows=3 width=12)
Group Key: parent_id
-> Sort (cost=47.44..47.45 rows=3 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..47.42 rows=3 width=4)
Filter: (parent_id = ANY ('{1596,1641,1629}'::integer[]))