Is there a way to define variables that can be references in Flink SQL? Specifically on the table properties so that username/passwords don't need to be specified in plaintext?

There isn’t unfortunately

Hm okay that is disappointing. Thanks for the prompt reply though @Martijn Visser

@Zachary Piazza If it helps, I've gotten around this using a pre-process script that performs an

envsubst

on the raw SQL to replace strings like $MY_SECRET with an env var value of the same name.