alamb commented on code in PR #13206:
URL: https://github.com/apache/datafusion/pull/13206#discussion_r1826051800
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datafusion/expr/src/expr.rs:
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@@ -1574,8 +1574,13 @@ impl Expr {
/// Returns true if the expression is volatile, i.e. whether it can return
different
/// results when evaluated multiple times with the same input.
- pub fn is_volatile(&self) -> Result<bool> {
- self.exists(|expr| Ok(expr.is_volatile_node()))
+ ///
+ /// For example the function call `RANDOM()` is volatile as each call will
+ /// return a different value.
+ ///
+ /// See [`Volatility`] for more information.
+ pub fn is_volatile(&self) -> bool {
+ self.exists(|expr| Ok(expr.is_volatile_node())).unwrap()
Review Comment:
I will add the comment in a follow on PR The non fallable exists variant is
an interesting idea -- maybe we can file a follow on issue for it
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