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I'm also interested in the state of this API -- I have it working with Spark 3.0.3, but Spark 3.2.x was broken. I really like the work that's been done, so I'd like to avoid moving back to the Scala/Python universes instead

Well, the project is completely open source, so if you want a version upgrade that's not present yet, you could consider making a pull request yourself :) (if you have the time of course). For now I did it in like 15 minutes: <https://github.com/JetBrains/kotlin-spark-api/pull/117|https://github.com/JetBrains/kotlin-spark-api/pull/117> so when it gets accepted, the API will have spark 3.2.0 support :)

<https://github.com/JetBrains/kotlin-spark-api/releases/tag/kotlin-spark-3.2-1.0.3> 3.2 support is here :slightly_smiling_face: