// an eval node always has at least a LIAN before it, so, tuples that reach it
// always have at least one tuple parent
final LeftTupleImpl parentTuple = new LeftTupleImpl( f0,
null,
true );
final LeftTuple tuple0 = sink.createLeftTuple( parentTuple,
sink,
null, true);
// Tuple should pass and propagate
node.assertLeftTuple( tuple0,