@Override
    public synchronized void close() throws IOException {
      // assuming that this closes the underlying streams
      deserializer.close();
    }
Returns the next row # and value.

@param key
         - void as these files have a value only
@param value
         - the row container which is always re-used, but the internal
         value may be set to a new Object
@return whether the key and value were read. True if they were and false
        if EOF
@exception IOException
             from the deserializer
ql/src/java/org/apache/hadoop/hive/ql/io/FlatFileInputFormat.java