private void deleteMetadataColumns(final Transaction tx,final String nodeId,final List<Column> columns){
  requireNonNull(tx);
  requireNonNull(columns);
  requireNonNull(nodeId);
  final Bytes row=Bytes.of(nodeId);
  for (  final Column column : columns) {
    tx.delete(row,column);
  }
}

private void deleteMetadataColumns ( final Transaction tx , final String nodeId , final List < Column > columns ) { requireNonNull ( tx ) ; requireNonNull ( columns ) ; requireNonNull ( nodeId ) ; final Bytes row = Bytes . of ( nodeId ) ; for ( final Column column : columns ) { tx . delete ( row , column ) ; } }
deletes all metadata for a query node .
