I’ve been messing around with sql and stream processing off and on the last few months via https://github.com/zmaril/bpfquery and then https://github.com/zmaril/zquery, so I very much feel this comment. I didn’t want to build out my own stream processing architecture in bpfquery, it was getting pretty tough pretty fast, so I switched over to a datafusion backend in zquery in the hopes that it could do stream processing well. It can handle static data really well, much better the home grown half engine I made in bpfquery, but streaming sql isn’t easily possible at the moment, everybody is building their own implementations and trying to upstream what they need, no coherent whole from data fusion. I was looking into making an attempt with arroyo sometime, but I think the authors want that code to be used as a standalone binary and not as a library in something else, based on my last impression of it a while back. So, maybe in a few years it’ll be as easy to make a streaming database as it is now to make a normal one, but that’s not the case currently.