load 'auto_explain';
LOAD
set auto_explain.log_min_duration to 0;
SET
set auto_explain.log_analyze to on;
SET
set auto_explain.log_wal to on;
SET
set auto_explain.log_timing to on;
SET
set auto_explain.log_level to notice;
SET
BEGIN;
BEGIN
select
	c_count,
	count(*) as custdist
from
	(
		select
			c_custkey,
			count(o_orderkey)
		from
			customer left outer join orders on
				c_custkey = o_custkey
				and o_comment not like '%express%deposits%'
		group by
			c_custkey
	) as c_orders (c_custkey, c_count)
group by
	c_count
order by
	custdist desc,
	c_count desc;
NOTICE:  duration: 79135.272 ms  plan:
Query Text: select
	c_count,
	count(*) as custdist
from
	(
		select
			c_custkey,
			count(o_orderkey)
		from
			customer left outer join orders on
				c_custkey = o_custkey
				and o_comment not like '%express%deposits%'
		group by
			c_custkey
	) as c_orders (c_custkey, c_count)
group by
	c_count
order by
	custdist desc,
	c_count desc;
Sort  (cost=1537394.29..1537394.79 rows=200 width=16) (actual time=79135.163..79135.251 rows=46 loops=1)
  Sort Key: (count(*)) DESC, (count(orders.o_orderkey)) DESC
  Sort Method: quicksort  Memory: 27kB
  ->  HashAggregate  (cost=1537384.64..1537386.64 rows=200 width=16) (actual time=79135.102..79135.195 rows=46 loops=1)
        Group Key: count(orders.o_orderkey)
        Batches: 1  Memory Usage: 40kB
        ->  Finalize GroupAggregate  (cost=1000.89..1514883.91 rows=1500049 width=12) (actual time=9.729..78176.717 rows=1500000 loops=1)
              Group Key: customer.c_custkey
              ->  Gather Merge  (cost=1000.89..1484882.93 rows=3000098 width=12) (actual time=9.653..76486.538 rows=1500000 loops=1)
                    Workers Planned: 2
                    Workers Launched: 2
                    ->  Partial GroupAggregate  (cost=0.86..1137597.16 rows=1500049 width=12) (actual time=0.237..64003.692 rows=500000 loops=3)
                          Group Key: customer.c_custkey
                          ->  Nested Loop Left Join  (cost=0.86..1091541.80 rows=6210974 width=12) (actual time=0.124..61389.090 rows=5113286 loops=3)
                                ->  Parallel Index Only Scan using pk_customer on customer  (cost=0.43..28594.88 rows=625020 width=4) (actual time=0.068..368.788 rows=500000 loops=3)
                                      Heap Fetches: 0
                                ->  Index Scan using orders_o_custkey_idx on orders  (cost=0.43..1.53 rows=17 width=12) (actual time=0.015..0.117 rows=10 loops=1500000)
                                      Index Cond: (o_custkey = customer.c_custkey)
                                      Filter: ((o_comment)::text !~~ '%express%deposits%'::text)
                                      Rows Removed by Filter: 0
 c_count | custdist 
---------+----------
       0 |   500019
      10 |    66174
       9 |    65253
      11 |    62029
       8 |    58492
      12 |    55794
      13 |    49873
      19 |    46684
       7 |    46458
      18 |    46278
      14 |    45464
      20 |    45239
      17 |    44935
      16 |    43968
      15 |    43661
      21 |    42344
      22 |    38019
       6 |    32878
      23 |    32513
      24 |    26713
      25 |    21392
       5 |    19642
      26 |    15825
      27 |    11604
       4 |    10030
      28 |     8167
      29 |     5568
       3 |     4015
      30 |     3781
      31 |     2330
      32 |     1461
       2 |     1204
      33 |      864
      34 |      509
      35 |      273
       1 |      235
      36 |      152
      37 |       73
      38 |       39
      39 |       26
      42 |        7
      40 |        7
      41 |        5
      45 |        1
      44 |        1
      43 |        1
(46 rows)

COMMIT;
COMMIT