just a quick thought.
Dataiku DSS can be a bit finicky about it’s Boolean values. I don’t think that all upper case TRUE and FALSE are valid Boolean values from DSS’s point of view. If you can’t change these in the source you may need to bring this column in as text and then convert to Boolean in DSS. If I remember correctly lower case true and false are what is needed, or it might be camel case True and False.
Let us know how you get on with this.