viirya commented on code in PR #8520:
URL: https://github.com/apache/arrow-datafusion/pull/8520#discussion_r1424570095
##########
datafusion/expr/src/expr.rs:
##########
@@ -1692,6 +1692,24 @@ fn create_names(exprs: &[Expr]) -> Result<String> {
.join(", "))
}
+/// Whether the given expression is volatile, i.e. whether it can return
different results
+/// when evaluated multiple times with the same input.
+#[allow(clippy::match_like_matches_macro)]
+pub fn is_volatile(expr: &Expr) -> bool {
+ match expr {
+ Expr::ScalarFunction(func) => match func.func_def {
+ ScalarFunctionDefinition::BuiltIn(func) => match func {
Review Comment:
Okay.
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