/**
* 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.io.Text;
/**
* Expression to convert a string to lower case.
* Extends {@link StringUnaryUDF}.
*/
public class StringLower extends StringUnaryUDF {
private static final long serialVersionUID = 1L;
public StringLower(int colNum, int outputColumn) {
super(colNum, outputColumn, new IUDFUnaryString() {
private final Text t = new Text();
@Override
public Text evaluate(Text s) {
if (s == null) {
return null;
}
t.set(s.toString().toLowerCase());
return t;
}
});
}
public StringLower() {
super();
}
}