Observable's column summary feature is very nice! But I do think there's a very common lineage around these kinds of diagnostics which motivated both Observables and ours. See Jeff Heer's profiler paper[1] for more.

I'm very passionate about this area because I think "first mile problems" are underserved by most tools, but they take the longest to work out.

We had to do some gnarly things[2] to make this feature work well; and there's a lot of room to make it scale nicely and cover all DuckDB data types.

[1] http://vis.stanford.edu/papers/profiler [2] https://motherduck.com/blog/introducing-column-explorer/