bug#26807: [PATCH] graph: Add Cypher backend.

[Roel Janssen]

Ludovic Courtès writes:

> Hi,
>
> Roel Janssen <address@hidden> skribis:
>
>> Ludovic Courtès writes:
>>
>>> Hello!
>>>
>>> Roel Janssen <address@hidden> skribis:
>>>
>>>> From 0e9c95ef3473fa7066ccd5991b1c14400aaa7076 Mon Sep 17 00:00:00 2001
>>>> From: Roel Janssen <address@hidden>
>>>> Date: Sat, 6 May 2017 23:15:03 +0200
>>>> Subject: [PATCH] graph: Add Cypher backend.
>>>>
>>>> * guix/graph.scm (%cypher-backend): New variable.
>>>
>>> If Neo4j is free software and packageable (is it Java?), why not!
>>
>> Yes, it's Java, so a lot of work to package.
>>
>> Fortunately, there is also AgensGraph which is similar to the PostgreSQL
>> package, and it supports openCypher as well.  So I tried it, and the
>> queries will work with the latest git checkout of AgensGraph.  Their
>> latest release does not support automatically creating labels for the
>> nodes and edges, which was fixed in this commit:
>>
>> https://github.com/bitnine-oss/agensgraph/commit/5eaecc1d429a08165bb964013ab8ee5516a062e7
>>
>> So I think the output of what my patch produces should be fine for
>> multiple implementations of openCypher.
>
> OK.  Do these tools support interactive visualization in addition to
> graph queries?

Neo4j does that in a web browser, see:
https://neo4j.com/developer/guide-data-visualization/

AgensGraph does not AFAIK.  It just looks like (and it is) a PostgreSQL
prompt.

>
>>> Could you add a few lines in guix.texi under “Invoking guix graph”?
>>> Maybe give an example invocation of cypher and explain how it differs
>>> from the other backends (interactive features maybe?).
>>
>> Would the attached patch be fine for the manual?
>
> Yes, perfect (please squash it with the patch that adds the new
> backend).
>
> Thank you!
>
> Ludo’.

Great!  I will do that.

Kind regards,
Roel Janssen