How about creating separate functions, SYS_PROP(), and ENV_VAR() that do what they are supposed to do, and deprecate ENV() but keep it for backward compatibility?

ENV() function doesn't resolve environment variables but system properties -------------------------------------------------------------------------- Key: TEIID-5308 URL: https://issues.jboss.org/browse/TEIID-5308 Project: Teiid Issue Type: Bug Reporter: Mathieu Rampant Assignee: Steven Hawkins Priority: Critical the ENV() function, contrary to what its name suggests, doesn't look for environment variables but looks for system properties instead.