/**
* 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.Text;
/**
* UDFReplace replaces all substrings that are matched with a replacement substring.
*
*/
@Description(name = "replace",
value = "_FUNC_(str, search, rep) - replace all substrings of 'str' that "
+ "match 'search' with 'rep'", extended = "Example:\n"
+ " > SELECT _FUNC_('Hack and Hue', 'H', 'BL') FROM src LIMIT 1;\n"
+ " 'BLack and BLue'")
public class UDFReplace extends UDF {
private Text result = new Text();
public UDFReplace() {
}
public Text evaluate(Text s, Text search, Text replacement) {
if (s == null || search == null || replacement == null) {
return null;
}
String r = s.toString().replace(search.toString(), replacement.toString());
result.set(r);
return result;
}
}