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/tags/release-0.1-rc2/hive/external/ql/src/java/org/apache/hadoop/hive/ql/udf/UDFE.java

#
Java | 47 lines | 25 code | 5 blank | 17 comment | 0 complexity | 0e955b005343ddafeddb6a3298a215f9 MD5 | raw file
 1/**
 2 * Licensed to the Apache Software Foundation (ASF) under one
 3 * or more contributor license agreements.  See the NOTICE file
 4 * distributed with this work for additional information
 5 * regarding copyright ownership.  The ASF licenses this file
 6 * to you under the Apache License, Version 2.0 (the
 7 * "License"); you may not use this file except in compliance
 8 * with the License.  You may obtain a copy of the License at
 9 *
10 *     http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
18
19package org.apache.hadoop.hive.ql.udf;
20
21import org.apache.commons.logging.Log;
22import org.apache.commons.logging.LogFactory;
23import org.apache.hadoop.hive.ql.exec.Description;
24import org.apache.hadoop.hive.ql.exec.UDF;
25import org.apache.hadoop.hive.serde2.io.DoubleWritable;
26
27@Description (
28  name="E",
29  value="_FUNC_() - returns E ",
30  extended = "Example:\n"+
31     " > SELECT _FUNC_() FROM src LIMIT 1;\n" +
32     " 2.718281828459045"
33   )
34public class UDFE extends UDF {
35  @SuppressWarnings("unused")
36  private static Log LOG = LogFactory.getLog(UDFE.class.getName() );
37  DoubleWritable result = new DoubleWritable();
38
39  public UDFE() {
40    super();
41    result.set(Math.E);
42  }
43
44  public DoubleWritable evaluate() {
45    return result;
46  }
47}