func is just a catchall, whatever attribute you call off of it gets
sent to __getattr__ and becomes a function call. its designed to allow
any random database-specific call or custom stored procedure.
however, it does have some extra tricks going on, in that it will
de-parenthesize certain ANSI calls that are known to not want
parenthesis, like CURRENT_TIMESTAMP.
the docs are here:
http://www.sqlalchemy.org/docs/sqlconstruction.myt#sql_whereclause_functions
which you probably found, and it does need a good amount more
explanation. a. that you can call whatever name you want, and it
becomes a function b. that it knows about certain ANSI calls and c.
that you can create selectables out of functions now, which is useful
for calling stored procedures that return result sets.
its not in the generated docs because its just an instance variable,
that points to an instance of _FunctionGenerator which is private.
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