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With GridFS MongoDB provides a way for storing arbitrary binary files. We might use it to store "overflows" of large entities, e.g. it'd likely be a good fit for byte arrays:
@BinaryStorage(GRID_FS) // Advices the dialect to store the data separately and only a pointer in the entity document
private byte picture;
Provide native GridFS support
Support mapreduce native queries in MongoDB
Support distinct native queries in MongoDB