org.apache.hadoop.hive.ql.udf.generic.GenericUDFRpad 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.generic;
import org.apache.hadoop.hive.ql.exec.Description;
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 GenericUDFRpad extends GenericUDFBasePad {
public GenericUDFRpad() {
super("rpad");
}
@Override
protected void performOp(byte[] data, byte[] txt, byte[] padTxt, int len, Text str, Text pad) {
int pos;
// Copy the text
for (pos = 0; pos < str.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();
}
}
}