Github user kiszk commented on a diff in the pull request: https://github.com/apache/spark/pull/11209#discussion_r56040046 --- Diff: sql/catalyst/src/test/java/org/apache/spark/sql/catalyst/expressions/XXH64Suite.java --- @@ -0,0 +1,159 @@ +/* + * 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.spark.sql.catalyst.expressions; + +import java.nio.charset.StandardCharsets; +import java.util.HashSet; +import java.util.Random; +import java.util.Set; + +import org.apache.spark.unsafe.Platform; +import org.junit.Assert; +import org.junit.Test; + +/** + * Test the XXH64 function. + * + * Test constants were taken from the original implementation and the airlift/slice implementation. + */ +public class XXH64Suite { + + private static final XXH64 hasher = new XXH64(0); + + private static final int SIZE = 101; + private static final long PRIME = 2654435761L; + private static final byte[] BUFFER = new byte[SIZE]; + private static final int TEST_INT = Platform.getInt(BUFFER, Platform.BYTE_ARRAY_OFFSET); + private static final long TEST_LONG = Platform.getLong(BUFFER, Platform.BYTE_ARRAY_OFFSET); + + /* Create the test data buffer. */ + static { + long seed = PRIME; + for (int i = 0; i < SIZE; i++) { + BUFFER[i] = (byte)(seed >> 24); + seed *= seed; + } + } + + @Test + public void testKnownIntegerInputs() { + Assert.assertEquals(0x9256E58AA397AEF1L, hasher.hashInt(TEST_INT)); --- End diff -- Is this assertion endian independent? I think that this assertion assumes little-endian. s.m.u.getInt() and s.m.u.getLong fetch data by using machine native endian. http://java-performance.info/various-methods-of-binary-serialization-in-java/
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