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This adds unit tests for
GpuPartition
. During testing I found a number of issues that are also addressed in this PR:GpuShuffleEnv
was a Scala object that didn't support reinitializing which is needed for unit tests to run in various shuffle configurations. Updated it to support reinitializing the state.SparkSessionHolder
doesn't handle cases where other tests tear down the Spark session and a new one needs to be created. Updated the session holder to handle this case.