QUERY PLAN
GroupAggregate (cost=63.99..64.17 rows=9 width=12)
Group Key: parent_id
-> Sort (cost=63.99..64.02 rows=12 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..63.78 rows=12 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1535,1547,1546,1543,1548,1544,1549,1565,1596,1641}'::integer[])))