rraulinio commented on code in PR #1432:
URL: https://github.com/apache/iceberg-go/pull/1432#discussion_r3569420533


##########
udf/udf.go:
##########
@@ -0,0 +1,58 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+package udf
+
+import (
+       "slices"
+
+       "github.com/apache/iceberg-go"
+       "github.com/apache/iceberg-go/table"
+)
+
+// UDF is a function (SQL UDF) loaded from a catalog: its catalog identifier,
+// its metadata, and the location the metadata was loaded from.
+type UDF struct {
+       identifier       table.Identifier
+       metadata         Metadata
+       metadataLocation string
+}
+
+// New creates a UDF from its catalog identifier, metadata and metadata
+// location.
+func New(ident table.Identifier, meta Metadata, metadataLocation string) *UDF {
+       return &UDF{
+               identifier:       ident,
+               metadata:         meta,
+               metadataLocation: metadataLocation,
+       }
+}
+
+// Equals reports whether two UDFs have the same identifier, metadata
+// location and metadata.
+func (u UDF) Equals(other UDF) bool {

Review Comment:
   Kept the value receiver and argument to match `view.View` and added 
documentation making the intentional value-copy semantics and pointer-call 
usage explicit.



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