cay-832 (enums in in exp)

[Robert Zeigler]

So, I'm interested in getting this issue resolved rather quickly,  
which means I'm interested in jumping into the code.
But the implementation details of the expression parsing is not code  
I've spent a lot of time looking at.
Any pointers on where to start digging? I've rummaged through some of  
the expression code, some of the db adapter/sql translator code,
and took a look at the enum converter in the java-15 subproject.  But  
I don't have a good sense of the big picture of how all of the pieces  
fit together.
So... any pointers are appreciated (normally, I would just keep  
digging on my own, but I'm in a time crunch to finish a project right  
now, so the faster I can
fix this and patch it... :)

Thanks!
Robert