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

 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.io.LongWritable;
24
25/**
26 * UDFOPLongDivide.
27 *
28 */
29@Description(name = "div",
30    value = "a _FUNC_ b - Divide a by b rounded to the long integer",
31    extended = "Example:\n"
32    + "  > SELECT 3 _FUNC_ 2 FROM src LIMIT 1;\n" + "  1")
33public class UDFOPLongDivide extends UDF {
34  private LongWritable longWritable = new LongWritable();
35
36  public LongWritable evaluate(LongWritable a, LongWritable b) {
37    // LOG.info("Get input " + a.getClass() + ":" + a + " " + b.getClass() + ":"
38    // + b);
39    if ((a == null) || (b == null)) {
40      return null;
41    }
42
43    longWritable.set(a.get() / b.get());
44    return longWritable;
45  }
46}