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This is not a pull request that can be merged into the main branch. It uses the preview version of spark 4.0.0.
If you want to test this branch on your machine, use the latest version in this repository: https://repository.apache.org/content/groups/snapshots/org/apache/spark/spark-sql_2.13/4.0.0-SNAPSHOT/
And use it as the parameter to compile when you start your SBT repl, for example:
-Dspark.testVersion=4.0.0-20240831.001610-367
Also, spark 4.0 is not compatible with Java 8, only compatible with Java 17 and 21. I would recommend using 17 because it is also compatible with the latest versions of spark 3.x
At the moment of creation there are issues in a couple of tests that need fixing. One of them related to extracting a local date that could be a spark bug.