phillip-spice

I'm not too familiar with https://cube.dev/ - but my initial impression is they are focused more on providing APIs backed by SQL. They have a SQL API that emulates the PostgreSQL wire protocol, whereas Spice implements Arrow and Flight SQL natively. Their pre-aggregations are a similar concept to Spice's data accelerators. It also looks like they have their own query language, whereas Spice is native SQL as well.

Thanks Andrew! I'm looking forward to contributing back to DataFusion as well.

There is an effort within DataFusion to support pushing down joins across tables from the same remote provider that we will likely contribute to as well: https://github.com/datafusion-contrib/datafusion-federation

DuckDB is an in-process DB similar to SQLite - so every application in your stack would need to embed it. Spice is a binary that has Flight SQL and HTTP query endpoints - so multiple applications can connect to it from any language.