Constraint constraint = plan.getProperty(Property.SELECT_CRITERIA, Constraint.class);
filter = createRowFilter(constraint, context, columns, sources);
rows = NodeSequence.filter(rows, filter);
break;
case SET_OPERATION:
Operation operation = plan.getProperty(Property.SET_OPERATION, Operation.class);
boolean all = plan.getProperty(Property.SET_USE_ALL, Boolean.class);
PlanNode firstPlan = plan.getFirstChild();
PlanNode secondPlan = plan.getLastChild();
Columns firstColumns = context.columnsFor(firstPlan);
Columns secondColumns = context.columnsFor(secondPlan);