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So is Databricks like AWS RDS with some Lambda functions built around it?

No, Databricks is a distribution of Apache Spark with some value-added features such as the Delta Lake data format and a clean UI for hosting notebooks, doing cluster admin, etc

delta lake is open source too btw

only in name. check out the lack of traction for a lot of PRs on https://github.com/delta/delta-oss . Iceberg (https://iceberg.apache.org) is comparable but actually OSS.

https://github.com/delta/delta-oss

link seems to be broken.

this is the right url: https://github.com/delta-io/delta

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