org.apache.hadoop.hive.ql.udf.UDFLength 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;
import org.apache.hadoop.hive.ql.exec.Description;
import org.apache.hadoop.hive.ql.exec.UDF;
import org.apache.hadoop.hive.ql.exec.vector.VectorizedExpressions;
import org.apache.hadoop.hive.ql.exec.vector.expressions.StringLength;
import org.apache.hadoop.hive.ql.udf.generic.GenericUDFUtils;
import org.apache.hadoop.io.BytesWritable;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.Text;
/**
* UDFLength.
*
*/
@Description(name = "length",
value = "_FUNC_(str | binary) - Returns the length of str or number of bytes in binary data",
extended = "Example:\n"
+ " > SELECT _FUNC_('Facebook') FROM src LIMIT 1;\n" + " 8")
@VectorizedExpressions({StringLength.class})
public class UDFLength extends UDF {
private final IntWritable result = new IntWritable();
public IntWritable evaluate(Text s) {
if (s == null) {
return null;
}
byte[] data = s.getBytes();
int len = 0;
for (int i = 0; i < s.getLength(); i++) {
if (GenericUDFUtils.isUtfStartByte(data[i])) {
len++;
}
}
result.set(len);
return result;
}
public IntWritable evaluate(BytesWritable bw){
if (bw == null){
return null;
}
result.set(bw.getLength());
return result;
}
}