When defining a schema, there is a boolean column available called "Null" which is allegedly there to say whether nulls are valid values for that column. I would expect that this means you get some kind of type error when you pass a Java null into a non-nullable column, just as you get an error if a String column gets an Integer. But this does not happen. What is the purpose of this column? If I want to police nulls in my data flow, what is the least complicated way to do that?
