HasGroupFields (JPMML evaluator 1.7.0 API)

All Superinterfaces:

HasActiveFields

All Known Implementing Classes:

AssociationModelEvaluator
```
public interface HasGroupFields
extends HasActiveFields
```
A marker interface for models that expect the application to group many scalar-valued data records to a single collection-valued data record. The grouping is applied to active field values.
Aggregating data records:
```
 Evaluator evaluator = ...;
 List<? extends Map<String, ?>> preparedRecords = ...;
 if(evaluator instanceof HasGroupFields){
   HasGroupFields hasGroupFields = (HasGroupFields)evaluator;
   preparedRecords = EvaluatorUtil.groupRows(hasGroupFields, preparedRecords);
 }
 
```
See Also:

EvaluatorUtil.groupRows(HasGroupFields, List)

- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  java.util.List<InputField> getGroupFields()
  Gets the group fields of a Model from its MiningSchema.
  - Methods inherited from interface org.jpmml.evaluator.HasActiveFields
    getActiveFields

- Method Detail
  - getGroupFields
```
java.util.List<InputField> getGroupFields()
```
    Gets the group fields of a Model from its MiningSchema.
    
    This field set is relevant for association rules model type only.