unknowntpo commented on code in PR #5964:
URL: https://github.com/apache/gravitino/pull/5964#discussion_r1897712212


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clients/client-python/gravitino/api/expressions/partitions/identity_partition.py:
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@@ -0,0 +1,56 @@
+# 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.
+
+from abc import abstractmethod
+from typing import List, Any
+from .partition import Partition
+
+class IdentityPartition(Partition):
+    """
+    An identity partition represents a result of identity partitioning. For 
example, for Hive
+    partition
+
+    ```
+    PARTITION (dt='2008-08-08',country='us')
+    ```
+
+    its partition name is "dt=2008-08-08/country=us", field names are [["dt"], 
["country"]] and
+    values are ["2008-08-08", "us"].
+
+    This class is evolving and may change in future versions.
+    """
+
+    @abstractmethod
+    def field_names(self) -> List[List[str]]:
+        """
+        Returns the field names of the identity partition.
+
+        Returns:
+            List[List[str]]: A list of lists representing the field names of 
the identity partition.
+        """
+        pass
+
+    @abstractmethod
+    def values(self) -> List[Any]:

Review Comment:
   @xunliu thanks for you advice, but I have a little suggestion.
   
   In `IdentityPartition.java`, the method signature is 
   
   ```
   public interface IdentityPartition extends Partition {
   
     /** @return The field names of the identity partition. */
     String[][] fieldNames();
   
     /**
      * @return The values of the identity partition. The values are in the 
same order as the field
      *     names.
      */
     Literal<?>[] values();
   }
   ```
   
   where `values()` returns array of Literal with wildcard type parameter.
   
   so in Python, we need to define the method as
   
   ```
   class IdentityPartition(Partition):
       ...
       @abstractmethod
       def values(self) -> List[Literal[Any]]:
   ```



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