AlphaNode alphanode = ( AlphaNode ) node.getSinkPropagator().getSinks()[0];
LeftInputAdapterNode liaNode = (LeftInputAdapterNode) alphanode.getSinkPropagator().getSinks()[0];
JoinNode j = ( JoinNode ) liaNode.getSinkPropagator().getSinks()[0]; // $p2
TripleNonIndexSkipBetaConstraints c = ( TripleNonIndexSkipBetaConstraints ) j.getRawConstraints();
//assertEquals( "$name", ((VariableConstraint)c.getConstraint()).getRequiredDeclarations()[0].getIdentifier() );
assertTrue( c.isIndexed() );
BetaMemory bm = ( BetaMemory ) wm.getNodeMemory( j );
assertTrue( bm.getLeftTupleMemory() instanceof LeftTupleIndexHashTable );
assertTrue( bm.getRightTupleMemory() instanceof RightTupleIndexHashTable );
}