Don't suggest column for faceting if all values are 1

https://www.niche-museums.com/museums/museums?_facet=wikipedia_url

<img width="759" alt="museums__museums__42_rows" src="https://user-images.githubusercontent.com/9599/69387171-e58caf80-0c79-11ea-8b4e-cfe5861bc0ab.png">

Challenge is how to do this efficiently, since suggested facet queries need to be lightning fast.