We're in the process of converting a legacy application to NHibernate. One 
of the "interesting" aspects of this application is that part of it is 
written in Magic <http://www.magicsoftware.com/>, which does not allow 
columns to have NULL, but instead requires it to have a space. This means 
that some tables do not allow NULL in string columns, and some tables do.

I have already implemented some functionality to hide this fact using a few 
IType implementations. These work nicely and loading and saving entities 
already automatically convert spaces to NULL's.

However, I can't seem to find a way to fix querying. We're primarily using 
LINQ as our query mechanism, and I would like the following:

db.Addresses.Where(p => p.Street == null)

to be converted to:

where o.Street = ' '

instead of:

where o.Street is null

I've already implemented some custom LINQ functions, but because the 
developer does not know what fields to apply these functions to, I would 
very much prefer an automated mechanism. I have the feeling the best way to 
accomplish this may be using a custom HQL AST visitor (maybe there are 
better solutions), but I can't seem to find an extension point to provide 
something like that.

What is the best way to get this to work?

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