FakeBufferService fbs = new FakeBufferService();
ElementSymbol x = new ElementSymbol("x"); //$NON-NLS-1$
x.setType(DataTypeManager.DefaultDataClasses.INTEGER);
List<ElementSymbol> schema = Arrays.asList(x);
TupleBuffer tb = new TupleBuffer(new FakeBatchManager(), "x", schema, null, 4); //$NON-NLS-1$
tb.setForwardOnly(false);
tb.addTuple(Arrays.asList(1));
tb.addTuple(Arrays.asList(2));
tb.addTuple(Arrays.asList(3));