Github user albertostratio commented on the pull request:
https://github.com/apache/metamodel/pull/34#issuecomment-125479911
@kaspersorensen Do you mean something like this?:
```
public class SumAggregateFunction extends DefaultAggregateFunction<Long>
implements AggregateFunction {
public AggregateBuilder<Long> build() {
return new SumAggregateBuilder();
}
}
```
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