org.apache.hadoop.hive.ql.exec.vector.expressions.FuncLogWithBaseDoubleToDouble 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.exec.vector.expressions;
import org.apache.hadoop.hive.ql.exec.vector.VectorExpressionDescriptor;
public class FuncLogWithBaseDoubleToDouble extends MathFuncDoubleToDouble
implements ISetDoubleArg {
private static final long serialVersionUID = 1L;
private double base;
public FuncLogWithBaseDoubleToDouble(double scalarVal, int colNum, int outputColumn) {
super(colNum, outputColumn);
this.base = scalarVal;
}
public FuncLogWithBaseDoubleToDouble() {
super();
}
@Override
protected double func(double d) {
return Math.log(d) / Math.log(base);
}
public double getBase() {
return base;
}
public void setBase(double base) {
this.base = base;
}
// used to set the second argument to function (a constant base)
@Override
public void setArg(double d) {
this.base = d;
}
@Override
public VectorExpressionDescriptor.Descriptor getDescriptor() {
VectorExpressionDescriptor.Builder b = new VectorExpressionDescriptor.Builder();
b.setMode(VectorExpressionDescriptor.Mode.PROJECTION)
.setNumArguments(2)
.setArgumentTypes(
VectorExpressionDescriptor.ArgumentType.FLOAT_FAMILY,
VectorExpressionDescriptor.ArgumentType.FLOAT_FAMILY)
.setInputExpressionTypes(
VectorExpressionDescriptor.InputExpressionType.SCALAR,
VectorExpressionDescriptor.InputExpressionType.COLUMN);
return b.build();
}
}