jayzhan211 commented on code in PR #9304:
URL: https://github.com/apache/arrow-datafusion/pull/9304#discussion_r1497745314
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datafusion/expr/src/udf.rs:
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@@ -30,6 +30,15 @@ use std::fmt::Debug;
use std::fmt::Formatter;
use std::sync::Arc;
+/// Was the expression simplified?
+pub enum Simplified {
+ /// The function call was simplified to an entirely new Expr
+ Rewritten(Expr),
Review Comment:
We might extend it to Vec<Expr>
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