QUERY PLAN
GroupAggregate (cost=60.76..60.92 rows=8 width=12)
Group Key: parent_id
-> Sort (cost=60.76..60.79 rows=10 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..60.60 rows=10 width=4)
Filter: (parent_id = ANY ('{145,157,197,59,162,208,168,167,141,148}'::integer[]))