spark ColumnDictionary 源码
spark ColumnDictionary 代码
文件路径：/sql/core/src/main/java/org/apache/spark/sql/execution/columnar/ColumnDictionary.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.execution.columnar;
import org.apache.spark.sql.execution.vectorized.Dictionary;
public final class ColumnDictionary implements Dictionary {
private int[] intDictionary;
private long[] longDictionary;
public ColumnDictionary(int[] dictionary) {
this.intDictionary = dictionary;
}
public ColumnDictionary(long[] dictionary) {
this.longDictionary = dictionary;
}
@Override
public int decodeToInt(int id) {
return intDictionary[id];
}
@Override
public long decodeToLong(int id) {
return longDictionary[id];
}
@Override
public float decodeToFloat(int id) {
throw new UnsupportedOperationException("Dictionary encoding does not support float");
}
@Override
public double decodeToDouble(int id) {
throw new UnsupportedOperationException("Dictionary encoding does not support double");
}
@Override
public byte[] decodeToBinary(int id) {
throw new UnsupportedOperationException("Dictionary encoding does not support String");
}
}
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