tests/test-hive-udfs/src/main/java/com/cloudera/impala/TestUpdateUdf.java

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package com.cloudera.impala;

import org.apache.hadoop.hive.ql.exec.UDF;
import org.apache.hadoop.io.Text;

/**
 * Simple UDF for testing updating a UDF in HDFS. This file is built
 * twice, with one version of the jar having TestUpdateUdf.evaluate()
 * return "Old UDF" and the other "New UDF".
 *
 * The build produces a new version of the UDF. The tests make sure the
 * jar can be updated without having to restart Impalad.
 */
public class TestUpdateUdf extends UDF {
  public TestUpdateUdf() {
  }

  public Text evaluate() {
    return new Text("Old UDF");
  }
}