spark UnsafeDataUtils 源码
spark UnsafeDataUtils 代码
文件路径：/sql/catalyst/src/main/java/org/apache/spark/sql/catalyst/expressions/UnsafeDataUtils.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;
/**
* General utilities available for unsafe data
*/
final class UnsafeDataUtils {
private UnsafeDataUtils() {
}
public static byte[] getBytes(Object baseObject, long baseOffset, int sizeInBytes) {
if (baseObject instanceof byte[]
&& baseOffset == Platform.BYTE_ARRAY_OFFSET
&& (((byte[]) baseObject).length == sizeInBytes)) {
return (byte[]) baseObject;
}
byte[] bytes = new byte[sizeInBytes];
Platform.copyMemory(baseObject, baseOffset, bytes, Platform.BYTE_ARRAY_OFFSET,
sizeInBytes);
return bytes;
}
}
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