Decide on sync vs async DataFrame methods

[andygrove]

Is your feature request related to a problem or challenge?

The current design is using synchronous execution. In https://github.com/pgwhalen/datafusion-java everything seems to be async.

Let's decide how we want to handle this before we add too much more code.

Describe the solution you'd like

No response

Describe alternatives you've considered

No response

Additional context

No response

[andygrove]

@pgwhalen fyi

[pgwhalen]

While the old bindings in that repo present CompletableFutures, the newer ones I've written are synchronous. The work I've done is all on the datafusion-ffi-java branch in the datafusion-ffi-* directories, and I decided to follow the pattern this repo uses: presenting synchronous java calls with the rust bridge code using block_on.

I know the state of that fork is very confusing, sorry; I intended to clean it up a bit more before publicizing and I will try to find some time in the next couple of days to do that.

I originally had the goal of preserving the old bindings and marking them as deprecated, but with this new repo I'm not sure there's much point in that.