public void visit(LONotEqual op) throws VisitorException {
ExpressionOperator left = op.getLhsOperand();
ExpressionOperator right = op.getRhsOperand();
NotEqualExpression eq = new NotEqualExpression(exprPlan,
exprOpsMap.get(left), exprOpsMap.get(right));
exprOpsMap.put(op, eq);
}