org.apache.hadoop.hive.ql.udf.generic.LongNumDistinctValueEstimator Maven / Gradle / Ivy
/**
* 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.hadoop.hive.ql.udf.generic;
public class LongNumDistinctValueEstimator extends NumDistinctValueEstimator {
public LongNumDistinctValueEstimator(int numBitVectors) {
super(numBitVectors);
}
public LongNumDistinctValueEstimator(String s, int numVectors) {
super(s, numVectors);
}
@Override
public void addToEstimator(long v) {
/* Update summary bitVector :
* Generate hash value of the long value and mod it by 2^bitVectorSize-1.
* In this implementation bitVectorSize is 31.
*/
super.addToEstimator(v);
}
@Override
public void addToEstimatorPCSA(long v) {
super.addToEstimatorPCSA(v);
}
}