Made TextColumn implement Categorical<String>
so it can be used in grouping
@@ -46,7 +46,7 @@ import java.util.Set;
* of missing values in this class's methods.
*/
public class TextColumn extends AbstractColumn<String>
- implements StringFilters, StringMapFunctions, StringReduceUtils {
+ implements CategoricalColumn<String>, StringFilters, StringMapFunctions, StringReduceUtils {
public static final String MISSING_VALUE = TextColumnType.missingValueIndicator();
