jerqi commented on code in PR #7333: URL: https://github.com/apache/gravitino/pull/7333#discussion_r2177305456
########## api/src/main/java/org/apache/gravitino/stats/Statistic.java: ########## @@ -0,0 +1,66 @@ +/* + * 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; + +import java.util.Optional; +import org.apache.gravitino.annotation.Evolving; + +/** + * 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. + */ +@Evolving +public interface Statistic { + + /** The prefix for custom statistics. Custom statistics are user-defined statistics. */ + String CUSTOM_PREFIX = "custom."; + + /** + * Get the name of the statistic. + * + * @return The name of the statistic. + */ + String name(); + + /** + * Get the value of the statistic. The value is optional. If the statistic is not set, the value + * will be empty. + * + * @return An optional containing the value of the statistic if it is set, otherwise empty. + */ + Optional<StatisticValue> value(); + + /** + * The statistic is predefined by Gravitino if the value is true. The statistic is defined by + * users if the value if false. For example, the statistic "row_count" is a reserved statistic, A Review Comment: Fixed. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
