[jira] [Created] (CAY-1802) Records present in multiple prefetch paths are not merged correctly into final result

["Dzmitry Kazimirchyk (JIRA)" <ji...@apache.org>]

Dzmitry Kazimirchyk created CAY-1802:
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             Summary: Records present in multiple prefetch paths are not merged correctly into final result
                 Key: CAY-1802
                 URL: https://issues.apache.org/jira/browse/CAY-1802
             Project: Cayenne
          Issue Type: Bug
          Components: Core Library
    Affects Versions: 3.1B2
            Reporter: Dzmitry Kazimirchyk
         Attachments: CAY-1802-test.patch

If same records getting prefetched through multiple prefetch paths, the final result will content corrupted records with relationships set to null. Example:

Paintings are present in one prefetch path:

        SelectQuery q = new SelectQuery(Artist.class);
        q.addPrefetch(Artist.PAINTING_ARRAY_PROPERTY);
        q.addPrefetch(Artist.PAINTING_ARRAY_PROPERTY + "." + Painting.TO_PAINTING_INFO_PROPERTY);

artist.getPaintingArray().get(0).getPaintingInfo() will contain correct non null PaintingInfo record.


But if paintings are present in multiple prefetch paths:

        SelectQuery q = new SelectQuery(Artist.class);
        q.addPrefetch(Artist.PAINTING_ARRAY_PROPERTY);
        q.addPrefetch(Artist.PAINTING_ARRAY_PROPERTY + "." + Painting.TO_PAINTING_INFO_PROPERTY);
        q.addPrefetch(Artist.ARTIST_EXHIBIT_ARRAY_PROPERTY);
        q.addPrefetch(Artist.ARTIST_EXHIBIT_ARRAY_PROPERTY + "." + ArtistExhibit.TO_EXHIBIT_PROPERTY);
        q.addPrefetch(Artist.ARTIST_EXHIBIT_ARRAY_PROPERTY + "." + ArtistExhibit.TO_EXHIBIT_PROPERTY + "." + Exhibit.TO_GALLERY_PROPERTY);
        q.addPrefetch(Artist.ARTIST_EXHIBIT_ARRAY_PROPERTY + "." + ArtistExhibit.TO_EXHIBIT_PROPERTY + "." + Exhibit.TO_GALLERY_PROPERTY + "." + Gallery.PAINTING_ARRAY_PROPERTY);

artist.getPaintingArray().get(0).getPaintingInfo() will return null even if there is PaintingInfo associated with painting.

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