vladiksun commented on issue #1000:
URL: https://github.com/apache/age/issues/1000#issuecomment-1723307224
@jrgemignani Thanks for sharing the PR. I have built that branch to see how
it could affect our typical queries.
It turns out that for our use cases, we do not see much difference.
Usually, our typical queries are like this:
```
select properties from ag_catalog.cypher('test_graph',
$$
//EXPLAIN ANALYZE
MATCH (start_vertex:`scope` {hidden: false})
WHERE start_vertex.name = 'scope_1'
OR start_vertex.name = 'scope_2'
OR start_vertex.name = 'scope_3'
OR start_vertex.name = 'scope_4'
OR start_vertex.name = 'scope_5'
OR start_vertex.name = 'scope_6'
RETURN {
properties: properties(start_vertex),
___edge_reserved: properties(null)
}
UNION
MATCH (from:`scope` {hidden: false})
-[e1:`edges`*0..5 {hidden: false}]->(to1:`role` {hidden: false})
-[e2:`edges`*1..1 {hidden: false, fromCollection: 'role', toCollection:
'permission'}]->(to2:`permission` {hidden: false})
-[e3:`edges`*1..1 {hidden: false, fromCollection: 'permission',
toCollection: 'resource'}]->(to3:`resource` {hidden: false})
WHERE from.name = 'scope_1'
OR from.name = 'scope_2'
OR from.name = 'scope_3'
OR from.name = 'scope_4'
OR from.name = 'scope_5'
OR from.name = 'scope_6'
WITH
collect({ properties: properties(to1), ___edge_reserved:
properties(last(e1)) })
+ collect({ properties: properties(to2), ___edge_reserved:
properties(last(e2)) })
+ collect({ properties: properties(to3), ___edge_reserved:
properties(last(e3)) }) as result
UNWIND result as result_out
RETURN DISTINCT result_out
LIMIT 1000
$$) as (properties ag_catalog.agtype);
```
As you can see we use only one table (e_label) for edges and structures like
```
{hidden: false, fromCollection: 'role', toCollection: 'permission'}
```
improve the execution time because there is a call to a GIN index that cuts
unnecessary edges. That also helps simplify backend logic.
So, such a query:
```
select properties from ag_catalog.cypher('test_graph',
$$
//EXPLAIN ANALYZE
MATCH (from:`domain` {hidden: false})-[any_edge:`edges`*1..10 {hidden:
false, fromCollection: 'domain', toCollection: 'domain', relation:
'managed'}]->(to:`domain` {hidden: false, id: 'domain_root_1'})
WITH from, any_edge, to, head(any_edge) AS edge_check_in, head(any_edge) AS
edge_result_in
RETURN DISTINCT {
properties: properties(from),
___edge_reserved: properties(edge_result_in)
}
LIMIT 1000
$$) as (properties ag_catalog.agtype);
```
works even faster than the version with lots of edge tables.
```
select properties from ag_catalog.cypher('test_graph',
$$
//EXPLAIN ANALYZE
MATCH (from:`domain` {hidden:
false})-[any_edge:`E_DOMAIN_MANAGED_DOMAIN`*1..10 {hidden:
false}]->(to:`domain` {hidden: false, id: 'domain_root_1'})
WITH from, any_edge, to, head(any_edge) AS edge_check_in, head(any_edge) AS
edge_result_in
RETURN DISTINCT {
properties: properties(from),
___edge_reserved: properties(edge_result_in)
}
LIMIT 1000
$$) as (properties ag_catalog.agtype);
```
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