Add support for Databricks ADBC scanner

[luke-tesseralabs]

Hi, it would be amazing to gain support for Databricks through the adbc_scanner extension. I tried this today via ATTACH, and encountered a couple of issues:

1. The quoting around "catalog"."schema"."table" causes some issues. I think databricks doesn't use quoting the same way duckdb does, and needs to have a different character substituted in place of quotes.
2. Databricks ADBC driver does not support get table schema yet (see here, leading to lookup behavior during catalog/schema/table querying to fail.

I was wondering, to that second point, is the lack of get table schema a dealbreaker for ATTACH-style usage of this extension?

[rustyconover]

Hi @luke-tesseralabs,

We don't have access to DataBricks to test with our coding agents, but I do think the lack of get table schema will be problematic. The driver may be improved in the future to add that feature though, but we don't maintain the drivers ourselves.

How would you propose we would work around it for now?

Rusty

[luke-tesseralabs]

Hi @rustyconover , thanks for getting back so quickly! Perhaps a good start will be to resolve the former (the quoting syntax issue), and in the meanwhile, I can ask in the databricks-adbc repository about the get table schema support?

Edit: databricks-adbc feature request: adbc-drivers/databricks#558

[rustyconover]

If you tell me the quoting, I can ask Claude to code it up, or you can just send me the docs.

Rusty