comphead commented on code in PR #13354:
URL: https://github.com/apache/datafusion/pull/13354#discussion_r1837378124
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datafusion/expr-common/src/signature.rs:
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@@ -135,6 +134,8 @@ pub enum TypeSignature {
/// Null is considerd as `Utf8` by default
/// Dictionary with string value type is also handled.
String(usize),
+ /// Zero argument
+ ZeroArg,
Review Comment:
Its choice of wording yes. Another option we can take from
https://en.wikipedia.org/wiki/Arity and name it Nullary to be in sync with
unary, binary functions we already use.
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