org.apache.hadoop.hive.ql.udf.UDFSpace Maven / Gradle / Ivy
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* 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 java.util.Arrays;
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;
/**
* UDFSpace.
*
*/
@Description(name = "space", value = "_FUNC_(n) - returns n spaces", extended = "Example:\n "
+ " > SELECT _FUNC_(2) FROM src LIMIT 1;\n" + " ' '")
public class UDFSpace extends UDF {
private final Text result = new Text();
public Text evaluate(IntWritable n) {
if (n == null) {
return null;
}
int len = n.get();
if (len < 0) {
len = 0;
}
if (result.getBytes().length >= len) {
result.set(result.getBytes(), 0, len);
} else {
byte[] spaces = new byte[len];
Arrays.fill(spaces, (byte) ' ');
result.set(spaces);
}
return result;
}
}