eric-maynard commented on code in PR #1037:
URL: https://github.com/apache/polaris/pull/1037#discussion_r1974164489


##########
service/common/src/main/java/org/apache/polaris/service/catalog/response/ETaggedResponse.java:
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@@ -0,0 +1,46 @@
+/*
+ * 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 org.apache.polaris.service.catalog.response;
+
+/**
+ * Allows Iceberg response types to be wrapped alongside an ETag that
+ * can be unwrapped into the HTTP ETag header.
+ * @param <T> The type of the encapsulated response object
+ */
+public class ETaggedResponse<T> {
+
+    private final T response;
+
+    private final String etag;
+
+    public ETaggedResponse(T response, String etag) {

Review Comment:
   See [this 
comment](https://github.com/apache/polaris/pull/1037#discussion_r1972667805) -- 
are we building a `ETaggedResponse` always when there is no etag?



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