[lukekim]

Spice supports what DataFusion supports, which is generally yes but there is still work to do to push down more queries to TableProviders. For example, joins within a single source are not yet pushed down to the underlying provider.

You can write a single query across many data sources which is what we show in the demo on the Git repo.

[phillip-spice]

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