EXPLAIN ANALYZE WITH RECURSIVE downlots as (
        SELECT sl1.sadt_lot_id, 0 AS level, sl1.sadt_lot_id as root_id
        FROM sadt_lot sl1
        WHERE sl1.parent_lot_id IS NULL
    UNION
        SELECT sl2.sadt_lot_id, d.level + 1, d.sadt_lot_id as root_id
        FROM sadt_lot sl2
        INNER JOIN downlots d ON d.sadt_lot_id = sl2.parent_lot_id
)
SELECT sl.sadt_lot_id, array_agg(s.sadt_id)
FROM sadt_lot sl
LEFT JOIN sadt s ON s.sadt_lot_id = any(SELECT sadt_lot_id FROM downlots WHERE root_id = sl.sadt_lot_id)
WHERE sl.parent_lot_id IS NULL
group by sl.sadt_lot_id
ORDEr By sl.sadt_lot_id

GroupAggregate  (cost=42.53..15077.74 rows=1 width=36) (actual time=104.090..8436.505 rows=90 loops=1)
  Group Key: sl.sadt_lot_id
  CTE downlots
    ->  Recursive Union  (cost=0.00..42.39 rows=101 width=12) (actual time=0.006..0.104 rows=95 loops=1)
          ->  Seq Scan on sadt_lot sl1  (cost=0.00..2.94 rows=1 width=12) (actual time=0.005..0.019 rows=90 loops=1)
                Filter: (parent_lot_id IS NULL)
                Rows Removed by Filter: 5
          ->  Hash Join  (cost=0.33..3.74 rows=10 width=12) (actual time=0.027..0.028 rows=2 loops=2)
                Hash Cond: (sl2.parent_lot_id = d.sadt_lot_id)
                ->  Seq Scan on sadt_lot sl2  (cost=0.00..2.94 rows=94 width=8) (actual time=0.002..0.008 rows=95 loops=2)
                ->  Hash  (cost=0.20..0.20 rows=10 width=8) (actual time=0.010..0.010 rows=48 loops=2)
                      Buckets: 1024  Batches: 1  Memory Usage: 9kB
                      ->  WorkTable Scan on downlots d  (cost=0.00..0.20 rows=10 width=8) (actual time=0.001..0.004 rows=48 loops=2)
  ->  Nested Loop Left Join  (cost=0.14..15004.14 rows=6242 width=8) (actual time=8.234..8434.229 rows=11345 loops=1)
        Join Filter: (SubPlan 2)
        Rows Removed by Join Filter: 1112125
        ->  Index Only Scan using sadt_lot_sadt_lot_id_parent_lot_id_idx on sadt_lot sl  (cost=0.14..12.86 rows=1 width=4) (actual time=0.011..0.252 rows=90 loops=1)
              Index Cond: (parent_lot_id IS NULL)
              Heap Fetches: 90
        ->  Seq Scan on sadt s  (cost=0.00..635.83 rows=12483 width=8) (actual time=0.002..1.785 rows=12483 loops=90)
        SubPlan 2
          ->  CTE Scan on downlots  (cost=0.00..2.27 rows=1 width=4) (actual time=0.003..0.007 rows=1 loops=1123470)
                Filter: (root_id = sl.sadt_lot_id)
                Rows Removed by Filter: 94
Planning time: 0.203 ms
Execution time: 8436.598 ms