QUERY PLAN
GroupAggregate (cost=54.09..54.20 rows=6 width=12)
Group Key: parent_id
-> Sort (cost=54.09..54.11 rows=6 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..54.02 rows=6 width=4)
Filter: (parent_id = ANY ('{1732,1786,1787,1788,1789,1790}'::integer[]))