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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 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;
@Description(name = "log2",
    value = "_FUNC_(x) - Returns the logarithm of x with base 2",
    extended = "Example:\n"
    + "  > SELECT _FUNC_(2) FROM src LIMIT 1;\n" + "  1")
public class UDFLog2 extends UDF {
  private static double log2 = Math.log(2.0);
  private DoubleWritable result = new DoubleWritable();
  public UDFLog2() {

Returns the logarithm of "a" with base 2.
    if (a == null || a.get() <= 0.0) {
      return null;
    } else {
      .set(Math.log(a.get()) / );
      return ;
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