docs: Is ADBC support in DuckDB still in progress?

[raulcd]

What would you like help with?

On the documentation we can see:

ADBC support in DuckDB is still in progress.  See `duckdb/duckdb#7141
<https://github.com/duckdb/duckdb/issues/7141>`_ for details.

but if we go to the duckdb issue it's closed and all tasks have been done, should we update the documentation? I am happy to update the docs but just wanted to understand whether there are still things unsupported to link to those.

[paleolimbot]

I believe we can say that it's "supported"...I seem to remember there are some rough edges but it's pretty much all the way there (even Substrait, I think).

[lidavidm]

I think we can just link to their documentation, yeah. If we want to go the extra mile we could write up some recipes for the documentation here too.

[zeroshade]

A while back I had contributed the examples shown in https://duckdb.org/docs/api/adbc to the DuckDB documentation. If we want, we could also add the same examples here?