QUERY PLAN
Aggregate (cost=100.88..100.89 rows=1 width=8)
-> Sort (cost=100.86..100.87 rows=1 width=224)
Sort Key: s.end_at, s.created_at DESC
InitPlan 1 (returns $0)
-> Aggregate (cost=48.93..48.94 rows=1 width=32)
-> Seq Scan on tbl_tasks s_1 (cost=0.00..48.91 rows=8 width=13)
Filter: ((tree_path IS NOT NULL) AND (head_of = 1000) AND (status = '0'::smallint))
-> Group (cost=51.91..51.91 rows=1 width=224)
Group Key: s.id
-> Sort (cost=51.91..51.91 rows=1 width=18)
Sort Key: s.id
-> Seq Scan on tbl_tasks s (cost=0.00..51.90 rows=1 width=18)
Filter: ((parent_id IS NULL) AND (tree_path @> $0) AND (head_of = 1000) AND (status = '0'::smallint))