Feature Request: Exasol database connection (co-developed)

[mkcorneli]

Exasol would be a natural addition to the reader list. Exasol is an MPP analytical database with strong overlap with the R/Posit analyst user base and fits ggsql's SQL-first model naturally. I'm on Exasol's AI & Integrations team and can drive this PR if the maintainers are open to it. The approach would be an ExasolDialect mirroring src/reader/snowflake.rs, plus a driver=exasol branch in detect_dialect(). The generic OdbcReader handles the rest, and Exasol ships a mature ODBC driver. Is this team comfortable with me making a PR for the proposed approach?

[thomasp85]

You are welcome to prepare a PR and we can take it from there. Thanks!

[mkcorneli]

PR up: #386. Took the ExasolDialect + detect_dialect branch approach as described above, mirroring the Snowflake precedent. Every override SQL fragment was verified against exasol/docker-db:2025.2.0-arm64dev.0 via a probe-test campaign on a sibling branch (kept out of the PR to keep the diff focused, but happy to share if useful for review).