The DuckDB API I was talking above seem to already meet your use-cases? - Does this[1] solve the group by wish? - Depending on what you mean by projection, ma

The DuckDB API I was talking above seem to already meet your use-cases? - Does this[1] solve the group by wish? - Depending on what you mean by projection, maybe this[2] or this[3]? [1] https://duckdb.org/docs/api/python/relational_api#aggregateexpr-groups-- https://duckdb.org/docs/api/python/relational_api#aggregatee... [2] https://duckdb.org/docs/api/python/relational_api#projectexpr https://duckdb.org/docs/api/python/relational_api#projectexp... [3] https://duckdb.org/docs/api/python/expression#column-expression https://duckdb.org/docs/api/python/expression#column-express...