QUERY PLAN
Sort (cost=306.04..306.05 rows=1 width=236)
Sort Key: s.created_at DESC
InitPlan 1 (returns $0)
-> Aggregate (cost=150.01..150.02 rows=1 width=32)
-> Seq Scan on tbl_tasks s_1 (cost=0.00..150.00 rows=2 width=13)
Filter: ((tree_path IS NOT NULL) AND (head_of = 1001) AND (status = '0'::smallint))
-> Group (cost=156.01..156.02 rows=1 width=236)
Group Key: s.id
-> Sort (cost=156.01..156.01 rows=1 width=236)
Sort Key: s.id
-> Seq Scan on tbl_tasks s (cost=0.00..156.00 rows=1 width=236)
Filter: ((tree_path @> $0) AND (head_of = 1001) AND (status = '0'::smallint) AND (parent_id = 1600))