timsaucer commented on code in PR #16170:
URL: https://github.com/apache/datafusion/pull/16170#discussion_r2127331511


##########
datafusion/physical-expr/src/planner.rs:
##########
@@ -111,14 +112,42 @@ pub fn create_physical_expr(
     let input_schema: &Schema = &input_dfschema.into();
 
     match e {
-        Expr::Alias(Alias { expr, .. }) => {
-            Ok(create_physical_expr(expr, input_dfschema, execution_props)?)
+        Expr::Alias(Alias { expr, metadata, .. }) => {
+            if let Expr::Literal(v, prior_metadata) = expr.as_ref() {
+                let mut new_metadata = prior_metadata
+                    .as_ref()
+                    .map(|m| {
+                        m.iter()
+                            .map(|(k, v)| (k.clone(), v.clone()))
+                            .collect::<HashMap<String, String>>()
+                    })
+                    .unwrap_or_default();

Review Comment:
   When you try doing that there is some trait bound that is unsatisfied that I 
didn't spend any more time trying to dig through.



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