public T column(String columnId, ColumnType type) { def.addColumn(columnId, type); return (T) this; }
public T date(String columnId) { def.addColumn(columnId, ColumnType.DATE); return (T) this; }
public T text(String columnId) { def.addColumn(columnId, ColumnType.TEXT); return (T) this; }
public T number(String columnId) { def.addColumn(columnId, ColumnType.NUMBER); return (T) this; }
public T label(String columnId) { def.addColumn(columnId, ColumnType.LABEL); return (T) this; }