[ https://issues.apache.org/jira/browse/JCR-3089?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13121933#comment-13121933 ] 

Lukas Kahwe Smith commented on JCR-3089:
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yes this happened for a LEFT OUTER JOIN.
but thinking about it the problem is more that in my PHP layer we currently just ignore the selectorName, which means that the jcr:path in the result set is probably getting overwritten which is actually what is causing issues on my side.

so likely everything is ok here ..
                
> javax.jcr.RepositoryException when a JOIN SQL2 query is send via Davex and has results
> --------------------------------------------------------------------------------------
>
>                 Key: JCR-3089
>                 URL: https://issues.apache.org/jira/browse/JCR-3089
>             Project: Jackrabbit Content Repository
>          Issue Type: Bug
>          Components: jackrabbit-jcr-server, jackrabbit-spi2dav
>            Reporter: Lukas Kahwe Smith
>            Assignee: Alex Parvulescu
>             Fix For: 2.3.1
>
>         Attachments: JCR-3089-v2.patch, JCR-3089.patch
>
>
> see the following thread for details:
> http://www.mail-archive.com/users@jackrabbit.apache.org/msg17975.html
> assuming a data structure as follows:
> /foo [nt:unstructured]
> /foo/bar [nt:unstructured]
> /foo/bar@lala = huii (lala is string property of bar)
> /ding [nt:unstructured]
> /ding@dong = ##barUUID### (dong is a property of type "Reference")
> then the following code will throw an exception:
> DavexClient Client = new DavexClient(url);
> Repository repo = Client.getRepository();
> Credentials sc = new SimpleCredentials("admin","admin".toCharArray());
> Session s = repo.login(sc,workspace);
> QueryManager qm = s.getWorkspace().getQueryManager();
> String sql = "SELECT data.* FROM [nt:unstructured] AS data WHERE data.lala= 'huii'";
> sql = "SELECT * FROM [nt:unstructured] AS data INNER JOIN [nt:unstructured] AS referring ON referring.[dong] = data.[jcr:uuid] WHERE data.lala = 'huii'";
> sql = "SELECT * FROM [nt:unstructured] AS data INNER JOIN [nt:unstructured] AS referring ON ISDESCENDANTNODE(data, referring) WHERE data.lala = 'huii'";
> Query query = qm.createQuery(sql, Query.JCR_SQL2);
> QueryResult qr = query.execute();
> The first query works just fine and I can iterate over the result. Neither the second nor the third query works.
> In both cases I end up with a javax.jcr.RepositoryException. Note the exception only happens if the query returns results. Aka a join will work just fine if it matches no rows.

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