gstvg commented on code in PR #22362:
URL: https://github.com/apache/datafusion/pull/22362#discussion_r3291605521


##########
datafusion/proto/src/logical_plan/to_proto.rs:
##########
@@ -634,11 +635,35 @@ pub fn serialize_expr(
                     .unwrap_or(HashMap::new()),
             })),
         },
-        Expr::HigherOrderFunction(_) | Expr::Lambda(_) | 
Expr::LambdaVariable(_) => {
-            return Err(Error::General(
-                "Proto serialization error: Lambda not 
implemented".to_string(),
-            ));
+        Expr::HigherOrderFunction(HigherOrderFunction { func, args }) => {

Review Comment:
   Much easier to cross check the impls now 
https://github.com/apache/datafusion/pull/22362/changes/5688f3f79de2a71f0d73ad09e1158527aeae659a
 thanks
   (also did this to others similar matchs)



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