spark RecordComparator 源码
spark RecordComparator 代码
文件路径：/core/src/main/java/org/apache/spark/util/collection/unsafe/sort/RecordComparator.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.util.collection.unsafe.sort;
/**
* Compares records for ordering. In cases where the entire sorting key can fit in the 8-byte
* prefix, this may simply return 0.
*/
public abstract class RecordComparator {
/**
* Compare two records for order.
*
* @return a negative integer, zero, or a positive integer as the first record is less than,
* equal to, or greater than the second.
*/
public abstract int compare(
Object leftBaseObject,
long leftBaseOffset,
int leftBaseLength,
Object rightBaseObject,
long rightBaseOffset,
int rightBaseLength);
}
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