De-normalization optimizer research project

I am working on a research project that looks at an entire database access
layer written against a normalized database and suggests de-normalizations
to be done to the database structure. In effect looking at de-normalizations
as a kind of cache. I am looking for any code I can leverage to do this
work.

As documentation for the plan optimizer I found the document below. Is this
still relatively accurate?

http://www.postgresql.org/files/developer/optimizer.pdf

I have looked at the postgresql optimizer code years ago. And it was not too
hard to follow. I wonder if it is fairly independent from the rest of the
system. Or if anyone has suggestions of using a different optimizer
codebase. Here is a discussion I found here from years ago.

http://postgresql.1045698.n5.nabble.com/About-method-of-PostgreSQL-s-Optimizer-td1933859.html

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