FAQ
Ordering across relationship should use inner join
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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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