sqlglot

If not having to adjust queries is a major driver for your considerations, then I would highly recommend looking at SQLGlot (https://github.com/tobymao/sqlglot), a transpiler that makes you (more) independent of query dialects. They already support 30 dialects (big vendors such as Snowflake, Databricks, BigQuery, but also loads of the specialists such as ClickHouse, SingleStore or Exasol). Repo is maintained extremely well. Picking the best solution for your concrete workload (and your future demands) should be equally important to the implementation effort, to avoid that you run into walls later on. At least as long as data volume, query complexity or concurrency scalability can be challenges.

Agreed, and it's an amazingly well-maintained GitHub repo: https://github.com/tobymao/sqlglot Big kudos to Toby and the team.

Ibis has sqlglot for parsing and rewriting SQL query graphs; and there's sql-to-ibis: https://github.com/ibis-project/ibis/issues/9529 sqlglot: https://github.com/tobymao/sqlglot : > SQLGlot is a no-dependency SQL parser, transpiler, optimizer, and engine [written in Python]. It can be used to format SQL or translate between 24 different dialects like DuckDB, Presto / Trino, Spark / Databricks, Snowflake, and BigQuery. It aims to read a wide variety of SQL inputs and output syntactically and semantically correct SQL in the targeted dialects.

Thanks for the suggestion! I am using https://github.com/tobymao/sqlglot, which magically supports most SQL dialects. And yes, support for DuckDB is also in future plans

I recommend anyone who works with databases to write a simple engine. It's a lot simpler than you may think and it's a great exercise. If using python, sqlglot (https://github.com/tobymao/sqlglot) let's you skip all the parsing and it even does some simple optimizations. From the parsed query tree it's pretty straightforward to build a logical plan and execute that. You can even use python's builtin ast module to convert sql expressions into python ones (so no need for a custom interpreter!)