MichaelScofield commented on code in PR #4553:
URL: https://github.com/apache/arrow-datafusion/pull/4553#discussion_r1045378138


##########
datafusion/proto/src/to_proto.rs:
##########
@@ -546,6 +546,8 @@ impl TryFrom<&Expr> for protobuf::LogicalExprNode {
                             protobuf::BuiltInWindowFunction::from(fun).into(),
                         )
                     }
+                    // TODO(LFC): Implement user-defined aggregate window 
function proto ser/de.

Review Comment:
   Returned a new variant as in `to_proto::Err::NotImplement`, and tracked in 
issue #4584 



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