if (processor == null) {
throw new ExprValidationException("A named window by name '" + onTriggerDesc.getWindowName() + "' does not exist");
}
// validate context
processor.validateOnExpressionContext(contextName);
EventType namedWindowType = processor.getNamedWindowType();
outputEventType = namedWindowType;
services.getStatementEventTypeRefService().addReferences(statementContext.getStatementName(), new String[] {onTriggerDesc.getWindowName()});