// Here we merge these two projects into one BagDereferenceExpression
if( op instanceof LOProject ) {
ProjectExpression projectExp = (ProjectExpression) exprOpsMap.get(op);
// Add the bag in the plan
BagDereferenceExpression bagDR = new BagDereferenceExpression(
exprPlan, project.getType(), project.getProjection(), projectExp);
exprOpsMap.put(project, bagDR);
translateConnection( project, bagDR );
}