QUERY PLAN
Limit (cost=98.78..98.79 rows=1 width=191)
InitPlan 1 (returns $0)
-> Aggregate (cost=47.88..47.89 rows=1 width=32)
-> Seq Scan on tbl_tasks s_1 (cost=0.00..47.73 rows=60 width=13)
Filter: ((tree_path IS NOT NULL) AND (status = '0'::smallint))
-> Sort (cost=50.90..50.90 rows=1 width=191)
Sort Key: s.end_at, s.created_at DESC
-> Group (cost=50.88..50.89 rows=1 width=191)
Group Key: s.id
-> Sort (cost=50.88..50.89 rows=1 width=191)
Sort Key: s.id
-> Seq Scan on tbl_tasks s (cost=0.00..50.87 rows=1 width=191)
Filter: ((parent_id IS NULL) AND (tree_path @> $0) AND (status = '0'::smallint))