public TableDesc.ClusteredByDesc buildClusterBy() {
    TableDesc.ClusteredByDesc x = new TableDesc.ClusteredByDesc();
    x.columnNames = new ArrayList<String>();
    x.columnNames.add("id");
    x.sortedBy = buildSortedBy();
    x.numberOfBuckets = 16;
    return x;
  }
TestDesc - Test the desc objects that are correctly converted to
and from json.  This also sets every field of the TableDesc object.
hcatalog/webhcat/svr/src/test/java/org/apache/hive/hcatalog/templeton/TestDesc.java