@Benchmark
  public Object read() throws IOException {
    return storageFormatTest.readRecords(recordReader);
  }
This method is invoked after every call to the methods to test. It closes
and cleans up all temporary files.

@throws IOException If it cannot close or delete temporary files.
itests/hive-jmh/src/main/java/org/apache/hive/benchmark/storage/ColumnarStorageBench.java