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https://issues.apache.org/jira/browse/JCR-2933?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13014481#comment-13014481
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Thomas Mueller commented on JCR-2933:
-------------------------------------
I'm not sure if the proposed solution always works, specially for 3+ way joins.
I think there should be a randomized test case that compares the result with a
relational database. I wrote such a test case, it could be adapted to SQL2:
http://code.google.com/p/h2database/source/browse/trunk/h2/src/test/org/h2/test/synth/TestNestedJoins.java
- this test case found quite a lot of problems, including problems in Apache
Derby: DERBY-4712 - therefore it probably makes sense to run the test against
other databases as well. I think the most stable database is PostgreSQL, but we
can't include it in our unit tests. Therefore, I would pick H2 and Apache Derby
(meaning run the test against Jackrabbit, H2, Derby, and compare the results).
> SQL2 Left Outer Join
> --------------------
>
> Key: JCR-2933
> URL: https://issues.apache.org/jira/browse/JCR-2933
> Project: Jackrabbit Content Repository
> Issue Type: Bug
> Components: jackrabbit-core
> Affects Versions: 2.2.4
> Reporter: Manfred Sattler
> Assignee: Jukka Zitting
> Attachments: JCR-2933-v2.patch, JCR-2933-v3.patch, JCR-2933.patch
>
>
> Create this nodes.
> def n1 = root.addNode("node1", "sling:SamplePage");
> n1.setProperty("n1prop1", "page1");
> def n2 = n1.addNode("node2", "sling:SampleContent");
> n2.setProperty("n2prop1", "content1");
> Execute this Query:
> Select * from [sling:SamplePage] as page left outer join
> [sling:SampleContent] as content on ISDESCENDANTNODE(content,page) where
> page.n1prop1 = 'page1' and content.n2prop1 = 'content1';
> The resultset have 1 row with 2 Nodes. This OK.
> Then execute this:
> Select * from [sling:SamplePage] as page left outer join
> [sling:SampleContent] as content on ISDESCENDANTNODE(content,page) where
> page.n1prop1 = 'page1' and content.n2prop1 = 'XXXXX';
> The resultset has 1 row with 1 node.
> This wrong. The result should be 0 rows.
> Old Versions, prior 2.2.2 have also 0 rows as result.
> Also, if nodes "n2" not exists, jackrabbit reports 1 row as result.
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