How would you categorize something like ClickHouse or Interana or Druid? Columnar I guess, but then the description of Column-family in the article doesn't match up with my experience of how those work.
I think those fall into a different category confusingly sometimes called column-oriented databases. They're primarily used for analytic-focused tasks and get their name from storing data by column instead of by row (all data in a single column is stored to disk together).
I didn't include those as a separate category here because they're basically relational databases with a different underlying storage strategy to allow for easier column-based aggregation and so forth.
My colleague shared this article [1] with me, which definitely helped inform how I distinguished between the two in my head.
[1] http://dbmsmusings.blogspot.com/2010/03/distinguishing-two-m...