@Override
public void operate( FlowProcess flowProcess, FunctionCall<CompositeFunction.Context> functionCall )
{
TupleEntry arguments = functionCall.getArguments();
Tuple key = TupleHasher.wrapTuple( this.tupleHasher, arguments.selectTupleCopy( groupingFields ) );
Context context = functionCall.getContext();
Tuple[] functorContext = context.lru.get( key );
if( functorContext == null )