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/tags/release-0.0.0-rc0/hive/external/ql/src/java/org/apache/hadoop/hive/ql/udf/UDFAbs.java

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Java | 71 lines | 38 code | 12 blank | 21 comment | 6 complexity | 19cab02f33659747747b3afc4f1a4f12 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.hadoop.hive.ql.exec.Description;
22import org.apache.hadoop.hive.ql.exec.UDF;
23import org.apache.hadoop.hive.serde2.io.DoubleWritable;
24import org.apache.hadoop.io.IntWritable;
25import org.apache.hadoop.io.LongWritable;
26
27/**
28 * UDFAbs.
29 *
30 */
31@Description(name = "abs",
32    value = "_FUNC_(x) - returns the absolute value of x",
33    extended = "Example:\n"
34    + "  > SELECT _FUNC_(0) FROM src LIMIT 1;\n"
35    + "  0\n"
36    + "  > SELECT _FUNC_(-5) FROM src LIMIT 1;\n" + "  5")
37public class UDFAbs extends UDF {
38  private final DoubleWritable resultDouble = new DoubleWritable();
39  private final LongWritable resultLong = new LongWritable();
40  private final IntWritable resultInt = new IntWritable();
41
42  public DoubleWritable evaluate(DoubleWritable n) {
43    if (n == null) {
44      return null;
45    }
46
47    resultDouble.set(Math.abs(n.get()));
48
49    return resultDouble;
50  }
51
52  public LongWritable evaluate(LongWritable n) {
53    if (n == null) {
54      return null;
55    }
56
57    resultLong.set(Math.abs(n.get()));
58
59    return resultLong;
60  }
61
62  public IntWritable evaluate(IntWritable n) {
63    if (n == null) {
64      return null;
65    }
66
67    resultInt.set(Math.abs(n.get()));
68
69    return resultInt;
70  }
71}