jerqi commented on code in PR #7850:
URL: https://github.com/apache/gravitino/pull/7850#discussion_r2268526776


##########
core/src/main/java/org/apache/gravitino/stats/storage/PartitionStatisticStorage.java:
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@@ -0,0 +1,112 @@
+/*
+ * 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.gravitino.stats.storage;
+
+import com.google.common.collect.Lists;
+import java.io.Closeable;
+import java.util.List;
+import java.util.stream.Collectors;
+import org.apache.gravitino.MetadataObject;
+import org.apache.gravitino.stats.PartitionRange;
+import org.apache.gravitino.stats.PartitionStatisticsDrop;
+
+/** Interface for managing partition statistics in a storage system. */
+public interface PartitionStatisticStorage extends Closeable {
+
+  /**
+   * Lists statistics for a given metadata object within a specified range of 
partition names. The
+   * implementation should guarantee the thread safe.
+   *
+   * @param metalake the name of the metalake
+   * @param metadataObject the metadata object for which statistics are being 
listed
+   * @param partitionRange the range of partition names for which statistics 
are being listed
+   * @return a list of {@link PersistedPartitionStatistics} objects, each 
containing the partition
+   *     name
+   */
+  List<PersistedPartitionStatistics> listStatistics(
+      String metalake, MetadataObject metadataObject, PartitionRange 
partitionRange);

Review Comment:
   I prefer using metadata object here. Because we have defined many classes 
which contained the metadata object. If we uses entity, we need to convert them 
and create many extra classes. I don't think it's necessary. Only the 
entityStore prefer using entity. Other interfaces, we can use metadata objects. 
But we should avoid mixing metadata object and entities in interfaces of the 
same class.



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