[hibernate-dev] Annotations patch for column read/write expressions (HHH-272)

[Rob Hasselbaum]

I'm working on an patch to expose HHH-272 functionality (custom column read
and write expressions).in Annotations. At Steve and Emmanuel's request, I'm
doing this by creating a new @o.h.a.Column annotation to supplement the
@javax.persistence.Column annotation, similar to what's in place today for
@Table. This will allow for future extension beyond this one use case,
eventually.

It's getting a bit dicey, though, because of the variety of places
@j.p.Column can show up--for example, inside @AttributeOverride and
@Columns. The question is how best to embed the companion @o.h.a.Column
instances in these contexts. Create a @o.h.a.AttributeOverride and
@o.h.a.AttributeOverrides? A totally separate grouping mechanism? It's a
little easier with @Columns because that's already in the org.hibernate
namespace hierarchy, so it can be modified. Thoughts?

-Rob
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