QUERY PLAN
GroupAggregate (cost=148.33..148.38 rows=3 width=12)
Group Key: parent_id
-> Sort (cost=148.33..148.34 rows=3 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..148.31 rows=3 width=4)
Filter: (parent_id = ANY ('{1580,1579,1577}'::integer[]))