private static int bytesToInt(byte[] bytes, int offset) {
    return ((0xFF & bytes[offset]) << 24)
        | ((0xFF & bytes[offset+1]) << 16)
        | ((0xFF & bytes[offset+2]) << 8)
        | (0xFF & bytes[offset+3]);
  }
@param bytes
@param offset
@return integer represented by the four bytes in <code>bytes</code>
 beginning at <code>offset</code>
serde/src/java/org/apache/hadoop/hive/serde2/io/TimestampWritableV2.java