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It would be nice to have some estimate of the data size (e.g. number of rows).

Hey, on datasets added from now on, this'll be an option. Check it out in action here (displayed under the image).

Was that what you were thinking?

Yes, it's what I meant.

But in this case there are 19 features (as said) or 10 features (no of columns)?

It's avtually 19, I just didn't understand all of them to be able to write proper descriptions.

Then it is better to write all columns, even if some with "(unknown)" desc.