| Name | Description | Type | Package | Framework |
| GroupByVisitor | Group features by one or several attributes and applies an aggregator visitor to each group. | Class | org.geotools.feature.visitor | GeoTools |
| GroupByVisitor .GroupByRawResult | Helper class that should be used by optimizations to set the results. | Class | org.geotools.feature.visitor.GroupByVisitor | GeoTools |
| GroupByVisitor .GroupByResult | This class implements the feature calculation result of the group by visitor. | Class | org.geotools.feature.visitor.GroupByVisitor | GeoTools |
| GroupByVisitorBuilder | Helper class to help building a valid group by visitor. | Class | org.geotools.feature.visitor | GeoTools |