Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/15513
@gatorsmaile it seems foldable is already being used to check if the given
expression is a literal or not in a lot of expressions here. For example, some
of expressions throw the exception "... should be a literal" if the expression
is not foldable.
Also, I think we should fix the expressions (I will raise a separate JIRA
and PR) because some of them look needing to check if it is actually a literal
or not (not foldable or not). I think I can differenciate it from literal in
another PR. I don't want to fix some codes here.
In addition, if you check the codes, it seems really okay to call it
literal in most cases. I don't think `an expression that evaluates to a
constant` is a minimised form or concise when users actually just put a literal
or constant as a argument.
Please let me make another PR to make it consistent and deal with it. It
_seems_ already inconsistent to differentiate an expression allowing constant
folding from a literal.
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