QUERY PLAN
GroupAggregate (cost=57.92..58.05 rows=7 width=12)
Group Key: parent_id
-> Sort (cost=57.92..57.94 rows=8 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..57.80 rows=8 width=4)
Filter: (parent_id = ANY ('{1697,1723,1734,1735,1745,1746,1751,1754}'::integer[]))