Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/15513
To differentiate literals from expressions, the simplest way is to add
`expr` or `expression` into the function name. For the arguments whose names do
not contain `expr`, they are treated as literal. I know there are multiple
exceptions. For example, the input might be neither expressions nor literals.
Then, we can explain it in the description.
Below is the online doc of Oracle functions:
https://docs.oracle.com/cd/E11882_01/server.112/e41084/functions115.htm#SQLRF00680
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