I also have to chime in since you're getting upvotes for your vague rehashing of ideas present in the thread already.

This will prove to be vastly easier to debug, and to modify in the future

String munging and concatting to generate SQL is a poor practice and makes things harder to debug, modify, and test. Any robust and secure code written to make this stuff work will end up looking a lot like SQL::Abstract so that is exactly where one should go from the beginning.