jrgemignani commented on issue #2194:
URL: https://github.com/apache/age/issues/2194#issuecomment-3145606964
@serdarmicrosoft I need to point out that these 2 commands are still not
quite the same -
```
psql-17.5-5432-pgsql=# 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 1 DESC LIMIT 10;
count | id
-------+-----------------
8889 | 844424930606649
8328 | 844424930455288
6882 | 844424930701142
6793 | 844424930595806
6165 | 844424930340731
5915 | 844424930542262
5899 | 844424930582002
5858 | 844424930295719
5699 | 844424930678986
5649 | 844424930222488
(10 rows)
psql-17.5-5432-pgsql=# SELECT * FROM cypher('goodreads_graph_x', $$ MATCH
(u:User)-[:HAS_INTERACTION]->(:Book) RETURN u.user_id, count(*) ORDER BY
count(*) DESC LIMIT 10 $$) AS (user_id agtype, interaction_count agtype);
user_id | interaction_count
------------------------------------+-------------------
"bc7862cf7449815372fc58c8a817b488" | 8889
"806c0fdc5bed9757ed4d3ca8e3a13be5" | 8328
"e1f84cc029a12d6b57ad10432a0d3649" | 6882
"b83502f98865ff9ed70755404c353b56" | 6793
"52f5430e583a5e0043b3e6c83953b68a" | 6165
"a2ed685cf6398e72c5ec21a556489761" | 5915
"b2b770716941c4aab7227ac62230cc7f" | 5899
"410ffd0e48b0899ec40b54e571c4607d" | 5858
"d93961c6b197f33c3747ceba6fafbbdc" | 5699
"2406ed0afc9f589ec7bf0766242371e0" | 5649
(10 rows)
```
**u.id** and **user_id** are different. **u.id** is the id of the vertex,
**user_id** is the id inside the vertex properties.
This would be the comparable command -
```
psql-17.5-5432-pgsql=# SELECT * FROM cypher('goodreads_graph_x', $$ MATCH
(u:User)-[:HAS_INTERACTION]->(:Book) RETURN count(*), id(u) ORDER BY count(*)
DESC LIMIT 10 $$) AS (interaction_count agtype, user_id agtype);
interaction_count | user_id
-------------------+-----------------
8889 | 844424930606649
8328 | 844424930455288
6882 | 844424930701142
6793 | 844424930595806
6165 | 844424930340731
5915 | 844424930542262
5899 | 844424930582002
5858 | 844424930295719
5699 | 844424930678986
5649 | 844424930222488
(10 rows)
```
Here is the explain analyze for this command -
```
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 (interaction_count agtype, user_id agtype);
QUERY PLAN
----------------------------------------------------------------------------------------------------------------------------------------------------------------
--------------------------------------------------------
Limit (cost=1007580.65..1007580.67 rows=10 width=64) (actual
time=17823.193..17844.658 rows=10 loops=1)
-> Sort (cost=1007580.65..1009192.36 rows=644686 width=64) (actual
time=17823.191..17844.655 rows=10 loops=1)
Sort Key: ((count(*))::agtype) DESC
Sort Method: top-N heapsort Memory: 26kB
-> Finalize GroupAggregate (cost=823871.40..993649.21 rows=644686
width=64) (actual time=17402.177..17766.446 rows=132661 loops=1)
Group Key: (age_id(_agtype_build_vertex(u.id,
_label_name('237668'::oid, u.id), u.properties)))
-> Gather Merge (cost=823871.40..974308.63 rows=1289372
width=40) (actual time=17402.160..17558.219 rows=133027 loops=1)
Workers Planned: 2
Workers Launched: 2
-> Sort (cost=822871.37..824483.09 rows=644686
width=40) (actual time=17394.384..17400.814 rows=44342 loops=3)
Sort Key: (age_id(_agtype_build_vertex(u.id,
_label_name('237668'::oid, u.id), u.properties)))
Sort Method: quicksort Memory: 3516kB
Worker 0: Sort Method: quicksort Memory: 3379kB
Worker 1: Sort Method: quicksort Memory: 3438kB
-> Partial HashAggregate
(cost=674786.11..743035.36 rows=644686 width=40) (actual
time=17102.089..17116.448 rows=44342 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: 6673kB
Worker 0: Batches: 1 Memory Usage: 6417kB
Worker 1: Batches: 1 Memory Usage: 6417kB
-> Parallel Hash Join
(cost=23994.82..342748.46 rows=4166747 width=32) (actual
time=2721.135..13781.338 rows=3333333 loops=3)
Hash Cond:
(_age_default_alias_0.start_id = u.id)
-> Parallel Hash Join
(cost=2374.89..219877.18 rows=4166747 width=8) (actual time=19.124..1877.394
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) (actu
al time=0.034..505.455 rows=3333333 loops=3)
-> Parallel Hash
(cost=1888.44..1888.44 rows=38916 width=8) (actual time=18.173..18.174
rows=31133 loops=3)
Buckets: 131072 Batches:
1 Memory Usage: 4736kB
-> Parallel Index Only
Scan using idx_book_id on "Book" _age_default_alias_1 (cost=0.29..1888.44
rows=38916
width=8) (actual time=0.104..7.185 rows=31133 loops=3)
Heap Fetches: 0
-> Parallel Hash
(cost=13802.19..13802.19 rows=268619 width=110) (actual time=118.915..118.916
rows=214895 loops=3)
Buckets: 65536 (originally
65536) Batches: 32 (originally 16) Memory Usage: 9792kB
-> Parallel Seq Scan on "User"
u (cost=0.00..13802.19 rows=268619 width=110) (actual time=0.045..42.617
rows=2148
95 loops=3)
Planning Time: 0.956 ms
Execution Time: 17847.382 ms
(33 rows)
psql-17.5-5432-pgsql=#
```
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