spark HiveHasher 源码
spark HiveHasher 代码
文件路径：/common/unsafe/src/main/java/org/apache/spark/sql/catalyst/expressions/HiveHasher.java
/*
* 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 org.apache.spark.unsafe.Platform;
/**
* Simulates Hive's hashing function from Hive v1.2.1
* org.apache.hadoop.hive.serde2.objectinspector.ObjectInspectorUtils#hashcode()
*/
public class HiveHasher {
@Override
public String toString() {
return HiveHasher.class.getSimpleName();
}
public static int hashInt(int input) {
return input;
}
public static int hashLong(long input) {
return (int) ((input >>> 32) ^ input);
}
public static int hashUnsafeBytes(Object base, long offset, int lengthInBytes) {
assert (lengthInBytes >= 0): "lengthInBytes cannot be negative";
int result = 0;
for (int i = 0; i < lengthInBytes; i++) {
result = (result * 31) + (int) Platform.getByte(base, offset + i);
}
return result;
}
}
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