I didn't - I wanted to build something I could understand, and the rust implementation comes with a load of (reasonable) complexity, some resulting from the execution model, some from performance requirements.

stepping has 3 Zset implementations - in memory, sqlite and postgres. Currently considering whether to write a small rust one.

There's some more details here: https://stepping.site/docs/internals/how-it-works/

Ahh, I see you're a cofounder at feldera :)

I have a couple of dbsp questions if you're feeling generous and have 10mins free - reach out ojhrussell at gmail