code: public ColumnModel column(String columnName) {// NOSONAR
  		for (ColumnModel columnModel : columns) {
  			if (columnModel.getColumnName() != null && columnModel.getColumnName().equalsIgnoreCase(columnName))
  				return columnModel;
  			if (columnModel.getEntityField() != null && columnModel.getEntityField().equalsIgnoreCase(columnName))
  				return columnModel;
  		}
  		return addColumn(columnName);
  	}
docs: find column in tableModel by given columnName, if not found, add a new column
  with columnName