Copilot commented on code in PR #8692:
URL: https://github.com/apache/gravitino/pull/8692#discussion_r3123243425


##########
clients/client-python/gravitino/api/stats/statistic.py:
##########
@@ -0,0 +1,74 @@
+# 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 ABC, abstractmethod
+from typing import Any, Final
+
+from gravitino.api.auditable import Auditable
+from gravitino.api.stats.statistic_value import StatisticValue
+
+
+class Statistic(Auditable, ABC):
+    """Statistic interface represents a statistic that can be associated with 
a metadata object.
+
+    It can be used to store various types of statistics, for example, table 
statistics, partition
+    statistics, fileset statistics, etc.
+    """
+
+    CUSTOM_PREFIX: Final[str] = "custom-"
+    """The prefix for custom statistics. Custom statistics are user-defined 
statistics."""
+
+    @abstractmethod
+    def name(self) -> str:
+        """Get the name of the statistic.
+
+        Returns:
+            str: the name of the statistic
+        """
+
+    @abstractmethod
+    def value(self) -> StatisticValue[Any] | None:
+        """Get the value of the statistic.
+
+        he value is optional. If the statistic is not set, the value will be 
empty.
+
+        Returns:
+            StatisticValue:
+                An optional containing the value of the statistic if it is 
set, otherwise empty.

Review Comment:
   The `value()` docstring appears inconsistent with the actual return type 
(`StatisticValue[Any] | None`) and has a typo (“he value…”). The docs should 
describe returning `None` when unset (or change the return type to an 
`Optional`-style wrapper if that’s the intended API).
   ```suggestion
           The value is optional. If the statistic is not set, this method 
returns `None`.
   
           Returns:
               StatisticValue[Any] | None: The value of the statistic if it is 
set, otherwise `None`.
   ```



##########
clients/client-python/gravitino/exceptions/base.py:
##########
@@ -205,6 +205,14 @@ class ForbiddenException(GravitinoRuntimeException):
     """An exception thrown when a user is forbidden to perform an action."""
 
 
+class IllegalStatisticNameException(IllegalArgumentException):
+    """An exception thrown when statistic has an illegal name"""

Review Comment:
   Docstring is missing an article and trailing period; current phrasing reads 
ungrammatically. Consider updating to something like “An exception thrown when 
a statistic has an illegal name.” to match surrounding exception docstrings.
   ```suggestion
       """An exception thrown when a statistic has an illegal name."""
   ```



##########
clients/client-python/gravitino/api/stats/statistic.py:
##########
@@ -0,0 +1,74 @@
+# 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 ABC, abstractmethod
+from typing import Any, Final
+
+from gravitino.api.auditable import Auditable
+from gravitino.api.stats.statistic_value import StatisticValue
+
+
+class Statistic(Auditable, ABC):
+    """Statistic interface represents a statistic that can be associated with 
a metadata object.
+
+    It can be used to store various types of statistics, for example, table 
statistics, partition
+    statistics, fileset statistics, etc.
+    """
+
+    CUSTOM_PREFIX: Final[str] = "custom-"
+    """The prefix for custom statistics. Custom statistics are user-defined 
statistics."""
+
+    @abstractmethod
+    def name(self) -> str:
+        """Get the name of the statistic.
+
+        Returns:
+            str: the name of the statistic
+        """
+
+    @abstractmethod
+    def value(self) -> StatisticValue[Any] | None:
+        """Get the value of the statistic.
+
+        he value is optional. If the statistic is not set, the value will be 
empty.
+
+        Returns:
+            StatisticValue:
+                An optional containing the value of the statistic if it is 
set, otherwise empty.

Review Comment:
   The `Returns:` section for `value()` still describes an “optional containing 
the value … otherwise empty”, but the type hint is `StatisticValue[Any] | 
None`. Please update the return docs to match the Python API (e.g., “returns 
the statistic value, or `None` if unset”).
   ```suggestion
           The value may be unset.
   
           Returns:
               StatisticValue[Any] | None:
                   The statistic value, or `None` if it is unset.
   ```



##########
clients/client-python/gravitino/api/stats/statistic.py:
##########
@@ -0,0 +1,74 @@
+# 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 ABC, abstractmethod
+from typing import Any, Final
+
+from gravitino.api.auditable import Auditable
+from gravitino.api.stats.statistic_value import StatisticValue
+
+
+class Statistic(Auditable, ABC):
+    """Statistic interface represents a statistic that can be associated with 
a metadata object.
+
+    It can be used to store various types of statistics, for example, table 
statistics, partition
+    statistics, fileset statistics, etc.
+    """
+
+    CUSTOM_PREFIX: Final[str] = "custom-"
+    """The prefix for custom statistics. Custom statistics are user-defined 
statistics."""
+
+    @abstractmethod
+    def name(self) -> str:
+        """Get the name of the statistic.
+
+        Returns:
+            str: the name of the statistic
+        """
+
+    @abstractmethod
+    def value(self) -> StatisticValue[Any] | None:
+        """Get the value of the statistic.
+
+        he value is optional. If the statistic is not set, the value will be 
empty.
+
+        Returns:
+            StatisticValue:
+                An optional containing the value of the statistic if it is 
set, otherwise empty.
+        """
+
+    @abstractmethod
+    def reserved(self) -> bool:
+        """The statistic is predefined by Gravitino if the value is true.
+
+        The statistic is defined by users if the value is false. For example, 
the statistic
+        "row_count" is a reserved statistic. A custom statistic name must 
start with "custom."
+        prefix to avoid name conflict with reserved statistics. Because 
Gravitino may add more

Review Comment:
   `CUSTOM_PREFIX` is defined as "custom-", but the `reserved()` docstring says 
custom statistic names must start with "custom.". This is misleading (and 
contradicts the constant/server-side validation). Please align the 
documentation with `CUSTOM_PREFIX` (or reference the constant directly).
   ```suggestion
           "row_count" is a reserved statistic. A custom statistic name must 
start with "custom-"
           prefix to avoid name conflict with reserved statistics, because 
Gravitino may add more
   ```



##########
clients/client-python/gravitino/api/stats/supports_statistics.py:
##########
@@ -0,0 +1,74 @@
+# 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 ABC, abstractmethod
+from typing import Any
+
+from gravitino.api.stats.statistic import Statistic
+from gravitino.api.stats.statistic_value import StatisticValue
+
+
+class SupportsStatistics(ABC):
+    """SupportsStatistics provides methods to list and update statistics.
+
+    A table, a partition or a fileset can implement this interface to manage 
its statistics.
+    """
+
+    @abstractmethod
+    def list_statistics(self) -> list[Statistic]:
+        """Lists all statistics.
+
+        Returns:
+            A list of statistics
+        """
+
+    @abstractmethod
+    def update_statistics(self, statistics: dict[str, StatisticValue[Any]]) -> 
None:
+        """Updates statistics with the provided values.
+
+        If the statistic exists, it will be updated with the new value. If the 
statistic does
+        not exist, it will be created. If the statistic is unmodifiable, it 
will throw an
+        `UnmodifiableStatisticException`. If the statistic name is illegal, it 
will throw an
+        `IllegalStatisticNameException`.
+
+        Args:
+            statistics: a map of statistic names to their values
+
+        Raises:
+            IllegalStatisticNameException: If the statistic name is illegal
+            UnmodifiableStatisticException: If the statistic is unmodifiable
+        """
+
+    @abstractmethod
+    def drop_statistics(self, statistics: list[str]) -> bool:

Review Comment:
   New public API surface (`SupportsStatistics` / `Statistic` / 
`StatisticValue`) was added without corresponding Python unit tests. Please add 
tests under `clients/client-python/tests/unittests/api/stats/` (at least 
covering importability and key constants/typing/ABC behavior) to keep the 
client’s unit test suite in sync with new APIs.



##########
clients/client-python/gravitino/exceptions/base.py:
##########
@@ -205,6 +205,14 @@ class ForbiddenException(GravitinoRuntimeException):
     """An exception thrown when a user is forbidden to perform an action."""
 
 
+class IllegalStatisticNameException(IllegalArgumentException):
+    """An exception thrown when statistic has an illegal name"""
+
+
+class UnmodifiableStatisticException(UnsupportedOperationException):
+    """An exception thrown when users modify an unmodifiable statistic"""

Review Comment:
   Docstring is missing a trailing period and reads awkwardly (“when users 
modify…”). Consider rephrasing to “An exception thrown when attempting to 
modify an unmodifiable statistic.” to be consistent with other exception 
docstrings.
   ```suggestion
       """An exception thrown when attempting to modify an unmodifiable 
statistic."""
   ```



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