LeftTuple childLeftTuple = rightTuple.getFirstChild();
FastIterator leftIt = accNode.getLeftIterator(ltm);
LeftTuple leftTuple = accNode.getFirstLeftTuple(rightTuple, ltm, context, leftIt);
constraints.updateFromFactHandle(contextEntry,
wm,
rightTuple.getFactHandle());
// first check our index (for indexed nodes only) hasn't changed and we are returning the same bucket
// We assume a bucket change if leftTuple == null