obelix74 commented on code in PR #3823:
URL: https://github.com/apache/polaris/pull/3823#discussion_r2834913777


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polaris-core/src/main/java/org/apache/polaris/core/storage/aws/SessionTagField.java:
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@@ -0,0 +1,116 @@
+/*
+ * 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.core.storage.aws;
+
+import java.util.Optional;
+import org.apache.polaris.core.storage.CredentialVendingContext;
+import software.amazon.awssdk.services.sts.model.Tag;
+
+/**
+ * Enum representing the supported fields that can be included as AWS STS 
session tags in credential
+ * vending. Each value knows its tag key and how to extract its value from a 
{@link
+ * CredentialVendingContext}.
+ *
+ * <p>These tags appear in CloudTrail events for correlation between catalog 
operations and S3 data
+ * access. Configure via {@code SESSION_TAGS_IN_SUBSCOPED_CREDENTIAL} using 
the {@link #configName}
+ * of each desired field.
+ */
+public enum SessionTagField {
+  REALM("realm", CredentialVendingContext.TAG_KEY_REALM) {
+    @Override
+    public Optional<Tag> buildTag(String principalName, 
CredentialVendingContext context) {
+      return 
Optional.of(tag(context.realm().orElse(AwsSessionTagsBuilder.TAG_VALUE_UNKNOWN)));
+    }
+  },
+  CATALOG("catalog", CredentialVendingContext.TAG_KEY_CATALOG) {
+    @Override
+    public Optional<Tag> buildTag(String principalName, 
CredentialVendingContext context) {
+      return Optional.of(
+          
tag(context.catalogName().orElse(AwsSessionTagsBuilder.TAG_VALUE_UNKNOWN)));
+    }
+  },
+  NAMESPACE("namespace", CredentialVendingContext.TAG_KEY_NAMESPACE) {
+    @Override
+    public Optional<Tag> buildTag(String principalName, 
CredentialVendingContext context) {
+      return 
Optional.of(tag(context.namespace().orElse(AwsSessionTagsBuilder.TAG_VALUE_UNKNOWN)));
+    }
+  },
+  TABLE("table", CredentialVendingContext.TAG_KEY_TABLE) {
+    @Override
+    public Optional<Tag> buildTag(String principalName, 
CredentialVendingContext context) {
+      return 
Optional.of(tag(context.tableName().orElse(AwsSessionTagsBuilder.TAG_VALUE_UNKNOWN)));
+    }
+  },

Review Comment:
   I think the views would use the existing table  tag field since tableName in 
CredentialVendingContext can hold either a table or view name.



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