@SuppressWarnings("rawtypes")
  private ContentSummary runTestGetInputSummary(JobConf jobConf,
      Properties properties, Collection<Path> testPaths, int bytesPerFile,
      Class<? extends InputFormat> inputFormatClass,
      Map<Path, ContentSummary> cache) throws IOException {
    return runTestGetInputSummary(jobConf, properties, testPaths, bytesPerFile,
        Collections.emptyList(), inputFormatClass, cache);
  }
Read several files so that their information is cached, then delete those
files and read them again to see if the results were cached from the first
read. If the cache is not working, the sizes will be off since the files no
longer exist in the file system.

@throws Exception e
ql/src/test/org/apache/hadoop/hive/ql/exec/TestGetInputSummary.java