[Sesse__]

After a quick look, I'm not sure if I would call this “industrial strength”. In particular, the join optimizer (typically the heart of a large-scale SQL optimizer) looks very rudimentary? And the statistics it uses have zero idea about correlation, no histograms beyond min/max…

[menaerus]

I was wondering about the same claim. However, I believe that JOIN's are a common weakness among OLAP database engines, and DataFusion is built on top of a columnar storage format - Apache Arrow.

[sanxiyn]

By being columnar, I guess you could say DataFusion has a good executor, but no, not a good optimizer.

[menaerus]

Not that I was trying to make any of those claims but just trying to correlate the domain with what appears to be a common problem in it.