I’m configuring a View which contains calculated columns that should be returning Boolean results. Here’s an anonymised version of the view:

CREATE VIEW `ItemView` AS SELECT Item.ID     ,ItemProperty1     ,ItemProperty2     ,ItemProperty3     ,EXISTS(SELECT ItemComponent.ItemID FROM ItemComponent WHERE ItemComponent.ItemID = Item.ID) AS Operation1Required     ,Item.Property4 <> ItemType.Property AS Operation2Required FROM Item INNER JOIN ItemType     ON Item.TypeID = ItemType.ID ORDER BY ItemProperty2 ASC 

At the moment, MariaDB metadata says that the type for the “Operation1Required” and “Operation2Required” columns is INT, even though they are both expressions with fundamentally Boolean results.

I want them to be BOOLEAN/TINYINT(1), because the view is being read by a strongly-typed client which is expecting Boolean values for these columns.

But the CAST() and CONVERT() functions in MySQL/MariaDB 10.1 don’t seem to be able to convert to TINYINT(1).

Is there another way I can specify the correct data type for these calculated columns in the View?