/**
* 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;
/**
* UDFRpad.
*
*/
@Description(name = "rpad",
value = "_FUNC_(str, len, pad) - Returns str, right-padded with pad to a length of len",
extended = "If str is longer than len, the return value is shortened to "
+ "len characters.\n"
+ "Example:\n"
+ " > SELECT _FUNC_('hi', 5, '??') FROM src LIMIT 1;\n"
+ " 'hi???'"
+ " > SELECT _FUNC_('hi', 1, '??') FROM src LIMIT 1;\n" + " 'h'")
public class UDFRpad extends UDF {
private final Text result = new Text();
public Text evaluate(Text s, IntWritable n, Text pad) {
if (s == null || n == null || pad == null) {
return null;
}
int len = n.get();
byte[] data = result.getBytes();
if (data.length < len) {
data = new byte[len];
}
byte[] txt = s.getBytes();
byte[] padTxt = pad.getBytes();
int pos;
// Copy the text
for (pos = 0; pos < s.getLength() && pos < len; pos++) {
data[pos] = txt[pos];
}
// Copy the padding
while (pos < len) {
for (int i = 0; i < pad.getLength() && i < len - pos; i++) {
data[pos + i] = padTxt[i];
}
pos += pad.getLength();
}
result.set(data, 0, len);
return result;
}
}