sungwy commented on code in PR #4409:
URL: https://github.com/apache/polaris/pull/4409#discussion_r3324994716


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polaris-core/src/main/java/org/apache/polaris/core/auth/PairwiseTargetAuthorizationIntent.java:
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@@ -0,0 +1,55 @@
+/*
+ * 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.auth;
+
+import com.google.common.base.Preconditions;
+import org.apache.polaris.core.entity.PolarisEntityType;
+import org.jspecify.annotations.NonNull;
+import org.jspecify.annotations.Nullable;
+
+/**
+ * Authorization intent for operations that may carry both a primary target 
and a related secondary
+ * target.
+ *
+ * <p>The primary target may be omitted for legacy root-scoped flows that rely 
on an implicit root
+ * primary plus an explicit secondary target.
+ */
+public record PairwiseTargetAuthorizationIntent(

Review Comment:
   Thanks for your thoughts everyone.
   
   One follow-up direction I explored is to keep operation as describing the 
action, and use the intent subtype to describe the relationship between the 
pairwise securables. I think the main value in splitting 
`PairwiseTargetAuthorizationIntent` further would be to replace generic target 
/ secondary with names that fully express the relationship between the 
`PolarisSecurables`.
   
   That would likely mean replacing PairwiseTargetAuthorizationIntent with a 
small set like:
   - RenameAuthorizationIntent(operation, from, to)
   - PolicyAttachmentAuthorizationIntent(operation, policy, attachedTo)
   - RoleAssignmentAuthorizationIntent(operation, role, assignee)
   - PrivilegeGrantAuthorizationIntent(operation, grantTarget, grantee)
   - possibly RootPrivilegeGrantAuthorizationIntent(operation, grantee) for the 
current root-scoped special case
   
   I see the value in this form, because it allows 
`PolarisAuthorizableOperation` to continue carrying the action, while the 
intent subtype expresses how the `PolarisSecurables` relate to each other.
   
   Let me know what you folks think about this approach



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