private Set<String> getSrcUDFs() {
    HashSet<String> srcUDFs = new HashSet<String>();
    // FIXME: moved default value to here...for now
    // i think this features is never really used from the command line
    String defaultTestSrcUDFs = "qtest_get_java_boolean";
    for (String srcUDF : QTestSystemProperties.getSourceUdfs(defaultTestSrcUDFs)) {
      srcUDF = srcUDF.trim();
      if (!srcUDF.isEmpty()) {
        srcUDFs.add(srcUDF);
      }
    }
    if (srcUDFs.isEmpty()) {
      throw new RuntimeException("Source UDFs cannot be empty");
    }
    return srcUDFs;
  }
Returns the default UDF names which should not be removed when resetting the test database

@return The list of the UDF names not to remove
itests/util/src/main/java/org/apache/hadoop/hive/ql/QTestUtil.java