public void export(ByteBuffer buf){
  buf.putInt(seqId);
  if (info.isRowBlockEnabled())   buf.putInt(nRows);
  export(primaryKey,buf);
  for (  ByteArray cb : cellBlocks) {
    export(cb,buf);
  }
}

public void export ( ByteBuffer buf ) { buf . putInt ( seqId ) ; if ( info . isRowBlockEnabled ( ) ) buf . putInt ( nRows ) ; export ( primaryKey , buf ) ; for ( ByteArray cb : cellBlocks ) { export ( cb , buf ) ; } }
write data to given buffer , like serialize
