QUERY PLAN
GroupAggregate (cost=48.21..48.26 rows=3 width=12)
Group Key: parent_id
-> Sort (cost=48.21..48.22 rows=3 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..48.19 rows=3 width=4)
Filter: (parent_id = ANY ('{1392,1425,1426}'::integer[]))