/**
* 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;
import org.apache.hadoop.hive.ql.exec.Description;
import org.apache.hadoop.hive.ql.exec.UDF;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.Text;
/**
* UDFAscii.
*
*/
@Description(name = "ascii",
value = "_FUNC_(str) - returns the numeric value of the first character"
+ " of str",
extended = "Returns 0 if str is empty or NULL if str is NULL\n"
+ "Example:\n"
+ " > SELECT _FUNC_('222') FROM src LIMIT 1;"
+ " 50\n"
+ " > SELECT _FUNC_(2) FROM src LIMIT 1;\n" + " 50")
public class UDFAscii extends UDF {
private final IntWritable result = new IntWritable();
public IntWritable evaluate(Text s) {
if (s == null) {
return null;
}
if (s.getLength() > 0) {
result.set(s.getBytes()[0]);
} else {
result.set(0);
}
return result;
}
}