SQL::Abstract versions from 1.90_01 before 2.000001_04 for Perl skip the injection_guard check for function names given with -func. injection_guard is documented to apply to every function name, but only the { -name => ... } shorthand goes through it. The explicit { -func => [ $name, ... ] } form puts $name into the SQL unchecked. An application that relies on injection_guard to reject an untrusted function name passed with -func allows SQL injection.
https://metacpan.org/release/GETTY/SQL-Abstract-2.000001_04/changes
https://github.com/dbsrgits/sql-abstract/commit/b6e7d991ac588b937e8943a5b28b6837ff276a51.patch