code: private void retrieveColumnData(Collection<TableSchemaImpl> tableDataSet) throws Exception {
  
  		for(TableSchemaImpl tableData : tableDataSet) {
  			retrieveColumnData(tableData);
  		}
  	}
docs: For a set of tables, retrieves access to columns specified in the security tables.
  This method uses the table 'dbsec_columns' to perform this work. The resulting information
  in the column data is incomplete: it lacks types and other elements.
  @param tableDataSet Tables to query
  @throws Exception