Support Databases other than DuckDB

[domoritz]

Create new connectors, for example to Postgres, Clickhouse, or Snowflake. Identify breakage points for Mosaic’s current SQL query generation and design solutions for translating from an internal "canonical" query language to different DB dialects.

A good starting point would be to leverage multi database support in DuckDB.

[weifanwu]

working on this issue! and almost done!

[derekperkins]

We're interested in BigQuery + StarRocks adapters. Once there's an adapter pattern, we'd be happy to help contribute SQL interface translations.

[MarcSkovMadsen]

I'm interested in Azure SQL and Azure Synapse databases.

[domoritz]

https://github.com/tobymao/sqlglot could be an interesting experiment to build a rest server that proxies queries to another database. I'm sure it's still tricky because of data loading but worth a try.

[weifanwu]

Wrote documentation for how to connect (PostgreSQL, MySQL, SQLite) using DuckDB extensions:

#430