static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(HashAggBatchCreator.class);
@Override
public RecordBatch getBatch(FragmentContext context, HashAggregate config, List<RecordBatch> children) throws ExecutionSetupException {
Preconditions.checkArgument(children.size() == 1);
return new HashAggBatch(config, children.iterator().next(), context);
}