}
@Override
protected void visit(LOAnd op) throws VisitorException {
String scope = op.getOperatorKey().scope;
BinaryComparisonOperator exprOp = new POAnd(new OperatorKey(scope, nodeGen.getNextNodeId(scope)), op.getRequestedParallelism());
exprOp.setAlias(op.getAlias());
exprOp.setLhs((ExpressionOperator)logToPhyMap.get(op.getLhsOperand()));
exprOp.setRhs((ExpressionOperator)logToPhyMap.get(op.getRhsOperand()));
LogicalPlan lp = op.getPlan();