public void unsetSchema() throws VisitorException{
for(LogicalOperator input: getInputs()) {
Collection<LogicalPlan> grpPlans = mJoinColPlans.get(input);
if(grpPlans!=null)
for(LogicalPlan plan : grpPlans) {
SchemaRemover sr = new SchemaRemover(plan);
sr.visit();
}
}
super.unsetSchema();
}