Polymorphic Data Sets

Polymorphic records are data sets that either do or don't have a particular column. Since it's polymorphic, you can talk about them in the abstracts. And they fit in with la hinley moter type inference. But i don't know if that's a related to this o're, like, no relation or yet's exactly the same kind of thing. I always mispronounce his name ecause it's dutch and, ii american, so idon't kowo ow to pronounce things.