vvysotskyi commented on a change in pull request #1646: DRILL-6852: Adapt current Parquet Metadata cache implementation to use Drill Metastore API URL: https://github.com/apache/drill/pull/1646#discussion_r260319148
########## File path: exec/java-exec/src/main/java/org/apache/drill/metastore/ColumnStatistics.java ########## @@ -0,0 +1,73 @@ +/* + * 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.drill.metastore; + +import java.util.Comparator; + +/** + * Represents collection of statistics values for specific column. + * + * @param <T> type of column values + */ +public interface ColumnStatistics<T> { Review comment: Implementation of this class may contain statistic values for a specific column. It is assumed that it may contain both exact and estimated statistics values. To distinguish them, I think a method which checks whether the statistic value is estimated or not should be added to this class. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] With regards, Apache Git Services
