CapnSpek commented on issue #829:
URL: https://github.com/apache/age/issues/829#issuecomment-1519091388
Ideally, the second MATCH should work as an intersection over the results of
the first MATCH. So the result should be only one vertex
" {"id": 844424930131969, "label": "Person", "properties": {"name":
"bobby"}}::vertex".
This is how it works in Neo4j as well, and the second MATCH does perform
intersection in case of properties with AGE as well. As demonstrated here
```
test=# SELECT * from cypher('test', $$
CREATE ({name:'bobby', age:25}),
(:Person {name:'bobby'}),
(:Bobby {name:'bobby', age:25, cigar:2})
$$) as (a agtype);
a
---
(0 rows)
test=# SELECT * from cypher('test', $$
MATCH (u {name:'bobby'})
MATCH (u {cigar:2})
RETURN u
$$) as (a agtype);
a
------------------------------------------------------------------------------------------------------------
{"id": 1407374883553282, "label": "Bobby", "properties": {"age": 25,
"name": "bobby", "cigar": 2}}::vertex
(1 row)
```
Another interesting result is this
```
test=# SELECT * from cypher('test', $$
MATCH (u:Bobby {name:'bobby'})
MATCH (u:Person)
RETURN u
$$) as (a agtype);
a
------------------------------------------------------------------------------------------------------------
{"id": 1407374883553281, "label": "Bobby", "properties": {"name":
"bobby"}}::vertex
{"id": 1407374883553282, "label": "Bobby", "properties": {"age": 25,
"name": "bobby", "cigar": 2}}::vertex
(2 rows)
```
And this
```
test=# SELECT * from cypher('test', $$
MATCH (u:Bobby {name:'bobby'})
MATCH (u:Person {age:25})
RETURN u
$$) as (a agtype);
a
------------------------------------------------------------------------------------------------------------
{"id": 1407374883553282, "label": "Bobby", "properties": {"age": 25,
"name": "bobby", "cigar": 2}}::vertex
(1 row)
```
It appears that AGE performs filtration based on the first MATCH clause,
ignores the label (if any) of the second clause, only performs filtration based
on the given properties and returns the result.
It should instead give an error regarding support of multiple labels (as of
now).
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