@Override
 public int hashCode() {
   return codec.hashCode()
       ^ path.hashCode()
       ^ type.hashCode()
       ^ Arrays.hashCode(encodings.toArray());
 }
 private ColumnChunkMetaData newMD(long big) {
   Set<Encoding> e = new HashSet<Encoding>();
   PrimitiveTypeName t = BINARY;
   ColumnPath p = ColumnPath.get("foo");
   CompressionCodecName c = CompressionCodecName.GZIP;
   BinaryStatistics s = new BinaryStatistics();
   ColumnChunkMetaData md = ColumnChunkMetaData.get(p, t, c, e, s, big, 0, 0, 0, 0);
   return md;
 }