private static void makeRenameCommand(Path file, Path newFile, PrintWriter pw) {
    //https://hadoop.apache.org/docs/r3.0.0-alpha2/hadoop-project-dist/hadoop-common/FileSystemShell.html#mv
    println(pw, "hadoop fs -mv " + file + " " + newFile + ";");
  }
count some heuristics - num files in {@link AcidUtils#ORIGINAL_PATTERN_COPY} format.  These
are supported but if there are a lot of them there will be a perf hit on read until
major compaction
ql/src/java/org/apache/hadoop/hive/ql/util/UpgradeTool.java