Had a similar thought. Azure Postgres has something similar to pg_parquet (pg_azure_storage), but we're looking into replacing it with pg_duckdb assuming the extension continues to mature.

It would be great if the Postgres community could get behind one good opensource extension for the various columnstore data use cases (querying data stored in an open columnstore format - delta, iceberg, etc. being one of them). pg_duckdb seems to have the best chance at being the goto extension for this.