SQL::Preproc TODO:
- test with Apache/mod_perl
- implement USING syntax
- finish SQL::Preproc::Teradata
- build test for SQL::Preproc::Teradata
- test with Apache/mod_perl
- finish SQL::Preproc::Runtime to reduce translated code size
- create SQL::Preproc::MySQL
- build test for SQL::Preproc::MySQL
- create SQL::Preproc::Pg
- build test for SQL::Preproc::Pg
- create SQL::Preproc::Oracle
- build test for SQL::Preproc::Oracle