Pg_parquet: An extension to connect Postgres and parquet

Parquet itself is actually not that interesting. It should be able to read (and even write) Iceberg tables.

Also, how does it compare to pg_duckdb (which adds DuckDB execution to Postgres including reading parquet and Iceberg), or duck_fdw (which wraps a DuckDB database, which can be in memory and only pass-through Iceberg/Parquet tables)?

Having the famously crashy DuckDB share a process and memory with PostgreSQL doesn't seem like the most robust setup.