When columns are hidden in an Aggregate, what happens to them?

When columns are hidden in an Aggregate, they are still part of the output of the Aggregate. This is important because even though these columns are not displayed in the visual representation or in the end user interface, they remain in the data that is processed and returned by the Aggregate. This can be useful for maintaining data integrity and ensuring that all required data is still accessible for further processing, such as data manipulation or when responding to client requests, all while keeping the visual output clean and focused on relevant information.

The options that suggest hidden columns cease to be part of the output or that they generate errors misunderstand the purpose of hiding columns in the context of data management within OutSystems. Hiding is purely a visual property that does not affect the underlying data structure or its validity in the application.