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https://issues.apache.org/cayenne/browse/CAY-928?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12613
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Andrus Adamchik commented on CAY-928:
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This can only be implemented when we change a SelectQuery translator to use
JOIN syntax (instead key1 = key2) ... I think we should do that at some point.
> Ordering across relationship should use left join
> -------------------------------------------------
>
> Key: CAY-928
> URL: https://issues.apache.org/cayenne/browse/CAY-928
> Project: Cayenne
> Issue Type: Bug
> Components: Cayenne Core Library
> Reporter: Ari Maniatis
> Assignee: Andrus Adamchik
> Priority: Critical
>
> When ordering across a relationship like this:
> SelectQuery qual = new SelectQuery(Painting.class);
> qual.addOrdering(new
> Ordering(Painting.ARTIST_PROPERTY+"."+Artist.NAME_PROPERTY, true, true));
> the SQL looks like this:
> SELECT t0.id FROM Painting t0, Artist t1 WHERE t0.artistId = t1.id ORDER BY
> t1.name
> but it should be like this:
> SELECT t0.id FROM Painting t0 LEFT JOIN Artist t1 ON t0.artistId = t1.id
> ORDER BY t1.name
> What this means is that at the moment Cayenne will exclude from this query
> all paintings with no related artist.
> Regardless of how one thinks NULLs should be sorted in this relationship, the
> addition of a new Ordering in Cayenne shouldn't change the number of records
> returned from the SelectQuery.
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