xiarixiaoyao commented on a change in pull request #3952: URL: https://github.com/apache/hudi/pull/3952#discussion_r754826413
########## File path: hudi-client/hudi-client-common/src/main/java/org/apache/hudi/optimize/HilbertCurve.java ########## @@ -0,0 +1,321 @@ +/* + * 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.hudi.optimize; + +import java.math.BigInteger; +import java.util.Arrays; + +/** + * Converts between Hilbert index ({@code BigInteger}) and N-dimensional points. + * + * <p> + * Note: + * <a href="https://github.com/davidmoten/hilbert-curve/blob/master/src/main/java/org/davidmoten/hilbert/HilbertCurve.java";>GitHub</a>). + * the Licensed of above link is also http://www.apache.org/licenses/LICENSE-2.0 + */ +public final class HilbertCurve { + + private final int bits; + private final int dimensions; + // cached calculations + private final int length; + + private HilbertCurve(int bits, int dimensions) { + this.bits = bits; + this.dimensions = dimensions; + // cache a calculated values for small perf improvements + this.length = bits * dimensions; + } + + /** + * Returns a builder for and object that performs transformations for a Hilbert + * curve with the given number of bits. + * + * @param bits Review comment: ok , let me fix it. -- 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: commits-unsubscr...@hudi.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
