pg_lake is an open source Postgres extension based on work done at Crunchy Data prior to the acquisition by Snowflake - you can find the repo here [1] and a blog post with more context on the project here [2]

[1] https://github.com/Snowflake-Labs/pg_lake

[2] https://www.snowflake.com/en/blog/engineering/pg-lake-postgr...