liyafan82 commented on a change in pull request #7326: URL: https://github.com/apache/arrow/pull/7326#discussion_r447442441
########## File path: java/vector/src/main/java/org/apache/arrow/vector/compression/CompressionCodec.java ########## @@ -0,0 +1,68 @@ +/* + * 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.arrow.vector.compression; + +import org.apache.arrow.memory.ArrowBuf; + +/** + * The codec for compression/decompression. + */ +public interface CompressionCodec { + + /** + * Given a buffer, estimate the compressed size. + * Please note this operation is optional, and some compression methods may not support it. + * + * @param input the input buffer to be estimated. + * @return the estimated size of the compressed data. + */ + long estimateCompressedSize(ArrowBuf input); Review comment: Sounds reasonable. Thank you. I have revised the code to simplify the interface. Maybe we can add the optimization in the future, if we belive it is necessary. ---------------------------------------------------------------- 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. For queries about this service, please contact Infrastructure at: us...@infra.apache.org
