Feldera speak from lived experience when they say 100+ column tables are common in their customer base. They speak from lived experience when they say there's no correlation in their customer base.

Feldera provides a service. They did not design these schemas. Their customers did, and probably over such long time periods that those schemas cannot be referred to as designed anymore -- they just happened.

IIUC Feldera works in OLAP primarily, where I have no trouble believing these schemas are common. At my $JOB they are, because it works well for the type of data we process. Some OLAP DBs might not even support JOINs.

Feldera folks are simply reporting on their experience, and people are saying they're... wrong?

Haha, looks like it.

I remember the first time I encountered this thing called TPC-H back when I was a student. I thought "wow surely SQL can't get more complicated than that".

Turns out I was very wrong about that. So it's all about perspective.

We wrote another blog post about this topic a while ago; I find it much more impressive because this is about the actual queries some people are running: https://www.feldera.com/blog/can-your-incremental-compute-en...