jrgemignani commented on issue #2194:
URL: https://github.com/apache/age/issues/2194#issuecomment-3190070294
@serdarmicrosoft I removed the rest leaving -
```
psql-17.5-5432-pgsql=# select tablename,indexname,indexdef from pg_indexes
where schemaname = 'goodreads_graph_x';
tablename | indexname |
indexdef
------------------+-----------------------+--------------------------------------------------------------------------------------------------
_ag_label_vertex | _ag_label_vertex_pkey | CREATE UNIQUE INDEX
_ag_label_vertex_pkey ON goodreads_graph_x._ag_label_vertex USING btree (id)
_ag_label_edge | _ag_label_edge_pkey | CREATE UNIQUE INDEX
_ag_label_edge_pkey ON goodreads_graph_x._ag_label_edge USING btree (id)
(2 rows)
```
**SQL**
```
psql-17.5-5432-pgsql=# explain analyze select count(*), u.id from
goodreads_graph_x."User" u, goodreads_graph_x."HAS_INTERACTION" h,
goodreads_graph_x."Book" b where u.id = h.start_id and b.id = h.end_id GROUP BY
u.id ORDER BY count(*) DESC LIMIT 10;
QUERY PLAN
------------------------------------------------------------------------------------------------------------------------------------------------
------------------------------------------
Limit (cost=838170.89..838170.92 rows=10 width=16) (actual
time=4981.262..5005.469 rows=10 loops=1)
-> Sort (cost=838170.89..839782.61 rows=644686 width=16) (actual
time=4981.260..5005.466 rows=10 loops=1)
Sort Key: (count(*)) DESC
Sort Method: top-N heapsort Memory: 25kB
-> Finalize GroupAggregate (cost=660908.50..824239.46 rows=644686
width=16) (actual time=4854.597..4977.144 rows=132661 loops=1)
Group Key: u.id
-> Gather Merge (cost=660908.50..811345.74 rows=1289372
width=16) (actual time=4854.587..4916.484 rows=135688 loops=1)
Workers Planned: 2
Workers Launched: 2
-> Sort (cost=659908.48..661520.19 rows=644686
width=16) (actual time=4848.318..4855.496 rows=45229 loops=3)
Sort Key: u.id
Sort Method: quicksort Memory: 3022kB
Worker 0: Sort Method: quicksort Memory: 2916kB
Worker 1: Sort Method: quicksort Memory: 2912kB
-> Partial HashAggregate
(cost=547684.39..586683.96 rows=644686 width=16) (actual
time=4812.863..4827.311 rows=4522
9 loops=3)
Group Key: u.id
Planned Partitions: 8 Batches: 1 Memory
Usage: 6929kB
Worker 0: Batches: 1 Memory Usage: 6673kB
Worker 1: Batches: 1 Memory Usage: 6673kB
-> Parallel Hash Join
(cost=22063.08..313304.87 rows=4166747 width=8) (actual time=2693.933..3832.376
rows=33
33333 loops=3)
Hash Cond: (h.start_id = u.id)
-> Parallel Hash Join
(cost=3853.15..228504.20 rows=4166747 width=8) (actual time=18.426..1859.249
rows
=3333333 loops=3)
Hash Cond: (h.end_id = b.id)
-> Parallel Seq Scan on
"HAS_INTERACTION" h (cost=0.00..184515.47 rows=4166747 width=16) (actual
time=0.034..500.278 rows=3333333 loops=3)
-> Parallel Hash
(cost=3166.40..3166.40 rows=54940 width=8) (actual time=17.692..17.693 rows=3113
3 loops=3)
Buckets: 131072 Batches:
1 Memory Usage: 4736kB
-> Parallel Seq Scan on
"Book" b (cost=0.00..3166.40 rows=54940 width=8) (actual time=0.009
..8.255 rows=31133 loops=3)
-> Parallel Hash
(cost=13802.19..13802.19 rows=268619 width=8) (actual time=118.693..118.694
rows=21489
5 loops=3)
Buckets: 262144 (originally
262144) Batches: 16 (originally 8) Memory Usage: 12384kB
-> Parallel Seq Scan on "User"
u (cost=0.00..13802.19 rows=268619 width=8) (actual time=0.049..55
.689 rows=214895 loops=3)
Planning Time: 0.411 ms
Execution Time: 5007.980 ms
(32 rows)
psql-17.5-5432-pgsql=#
```
**u_idc**
```
psql-17.5-5432-pgsql=# SELECT * FROM cypher('goodreads_graph_x', $$ explain
analyze MATCH (u:User)-[:HAS_INTERACTION]->(:Book) RETURN count(*), u_idc ORDER
BY count(*) DESC LIMIT 10 $$) AS (count agtype, id agtype);
QUERY PLAN
------------------------------------------------------------------------------------------------------------------------------------------------
-------------------------------------------------------------------
Subquery Scan on _ (cost=839782.61..839782.66 rows=10 width=64) (actual
time=5105.792..5129.789 rows=10 loops=1)
-> Limit (cost=839782.61..839782.63 rows=10 width=40) (actual
time=5105.788..5129.780 rows=10 loops=1)
-> Sort (cost=839782.61..841394.32 rows=644686 width=40) (actual
time=5105.786..5129.777 rows=10 loops=1)
Sort Key: ((count(*))::agtype) DESC
Sort Method: top-N heapsort Memory: 26kB
-> Finalize GroupAggregate (cost=660908.50..825851.17
rows=644686 width=40) (actual time=4855.134..5041.501 rows=132661 loops=1
)
Group Key: u.id
-> Gather Merge (cost=660908.50..811345.74
rows=1289372 width=16) (actual time=4855.120..4919.445 rows=134560 loops=1)
Workers Planned: 2
Workers Launched: 2
-> Sort (cost=659908.48..661520.19 rows=644686
width=16) (actual time=4848.028..4856.092 rows=44853 loops=3)
Sort Key: u.id
Sort Method: quicksort Memory: 2922kB
Worker 0: Sort Method: quicksort Memory:
2907kB
Worker 1: Sort Method: quicksort Memory:
2986kB
-> Partial HashAggregate
(cost=547684.39..586683.96 rows=644686 width=16) (actual
time=4813.103..4827.149 row
s=44853 loops=3)
Group Key: u.id
Planned Partitions: 8 Batches: 1
Memory Usage: 6673kB
Worker 0: Batches: 1 Memory Usage:
6673kB
Worker 1: Batches: 1 Memory Usage:
6929kB
-> Parallel Hash Join
(cost=22063.08..313304.87 rows=4166747 width=8) (actual time=2698.029..3826.705
r
ows=3333333 loops=3)
Hash Cond:
(_age_default_alias_0.start_id = u.id)
-> Parallel Hash Join
(cost=3853.15..228504.20 rows=4166747 width=8) (actual time=18.387..1856.38
1 rows=3333333 loops=3)
Hash Cond:
(_age_default_alias_0.end_id = _age_default_alias_1.id)
-> Parallel Seq Scan on
"HAS_INTERACTION" _age_default_alias_0 (cost=0.00..184515.47 rows=4
166747 width=16) (actual time=0.034..501.547 rows=3333333 loops=3)
-> Parallel Hash
(cost=3166.40..3166.40 rows=54940 width=8) (actual time=17.673..17.674 row
s=31133 loops=3)
Buckets: 131072
Batches: 1 Memory Usage: 4704kB
-> Parallel Seq
Scan on "Book" _age_default_alias_1 (cost=0.00..3166.40 rows=54940 wi
dth=8) (actual time=0.018..8.248 rows=31133 loops=3)
-> Parallel Hash
(cost=13802.19..13802.19 rows=268619 width=8) (actual time=127.643..127.644 rows
=214895 loops=3)
Buckets: 262144
(originally 262144) Batches: 16 (originally 8) Memory Usage: 12352kB
-> Parallel Seq Scan on
"User" u (cost=0.00..13802.19 rows=268619 width=8) (actual time=0.0
42..56.620 rows=214895 loops=3)
Planning Time: 0.481 ms
Execution Time: 5132.179 ms
(33 rows)
psql-17.5-5432-pgsql=#
```
**id(u)**
```psql-17.5-5432-pgsql=# SELECT * FROM cypher('goodreads_graph_x', $$
explain analyze MATCH (u:User)-[:HAS_INTERACTION]->(:Book) RETURN count(*),
id(u) ORDER BY count(*) DESC LIMIT 10 $$) AS (count agtype, id agtype);
QUERY PLAN
------------------------------------------------------------------------------------------------------------------------------------------------
-------------------------------------------------------------
Limit (cost=1016207.67..1016207.69 rows=10 width=64) (actual
time=17369.620..17386.003 rows=10 loops=1)
-> Sort (cost=1016207.67..1017819.38 rows=644686 width=64) (actual
time=17369.618..17386.000 rows=10 loops=1)
Sort Key: ((count(*))::agtype) DESC
Sort Method: top-N heapsort Memory: 26kB
-> Finalize GroupAggregate (cost=832498.42..1002276.23
rows=644686 width=64) (actual time=16953.437..17306.058 rows=132661 loops=1)
Group Key: (age_id(_agtype_build_vertex(u.id,
_label_name('237668'::oid, u.id), u.properties)))
-> Gather Merge (cost=832498.42..982935.65 rows=1289372
width=40) (actual time=16953.419..17099.214 rows=132995 loops=1)
Workers Planned: 2
Workers Launched: 2
-> Sort (cost=831498.39..833110.11 rows=644686
width=40) (actual time=16943.086..16950.235 rows=44332 loops=3)
Sort Key: (age_id(_agtype_build_vertex(u.id,
_label_name('237668'::oid, u.id), u.properties)))
Sort Method: quicksort Memory: 3384kB
Worker 0: Sort Method: quicksort Memory: 3440kB
Worker 1: Sort Method: quicksort Memory: 3507kB
-> Partial HashAggregate
(cost=683413.13..751662.38 rows=644686 width=40) (actual
time=16656.683..16671.162 rows=44
332 loops=3)
Group Key:
age_id(_agtype_build_vertex(u.id, _label_name('237668'::oid, u.id),
u.properties))
Planned Partitions: 16 Batches: 1 Memory
Usage: 6417kB
Worker 0: Batches: 1 Memory Usage: 6417kB
Worker 1: Batches: 1 Memory Usage: 6673kB
-> Parallel Hash Join
(cost=25473.08..351375.47 rows=4166747 width=32) (actual
time=2687.049..13682.043 rows=
3333333 loops=3)
Hash Cond:
(_age_default_alias_0.start_id = u.id)
-> Parallel Hash Join
(cost=3853.15..228504.20 rows=4166747 width=8) (actual time=18.775..1868.630
rows
=3333333 loops=3)
Hash Cond:
(_age_default_alias_0.end_id = _age_default_alias_1.id)
-> Parallel Seq Scan on
"HAS_INTERACTION" _age_default_alias_0 (cost=0.00..184515.47 rows=4166747
width=16) (actual time=0.032..504.195 rows=3333333 loops=3)
-> Parallel Hash
(cost=3166.40..3166.40 rows=54940 width=8) (actual time=18.347..18.348 rows=3113
3 loops=3)
Buckets: 131072 Batches:
1 Memory Usage: 4704kB
-> Parallel Seq Scan on
"Book" _age_default_alias_1 (cost=0.00..3166.40 rows=54940 width=8)
(actual time=0.010..8.536 rows=31133 loops=3)
-> Parallel Hash
(cost=13802.19..13802.19 rows=268619 width=110) (actual time=111.960..111.961
rows=214
895 loops=3)
Buckets: 65536 (originally
65536) Batches: 32 (originally 16) Memory Usage: 9824kB
-> Parallel Seq Scan on "User"
u (cost=0.00..13802.19 rows=268619 width=110) (actual time=0.045..
38.799 rows=214895 loops=3)
Planning Time: 0.448 ms
Execution Time: 17388.427 ms
(32 rows)
psql-17.5-5432-pgsql=#
```
Not much difference. This could be because the data was loaded in an orderly
way making indexes unnecessary?
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