Postgres has like 300+ types but mostly stuff like decimals should work the same way it does with Postgres (with the edge cases like NaN existing in Postgres but not parquets accordingly)
pg_lake maps types into their Parquet equivalent and otherwise stores as text representation, there are a few limitations like very large numerics.
https://github.com/Snowflake-Labs/pg_lake/blob/main/docs/ice...