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Investigate RDD.sample behavior change in Spark 3 #3379
Description
Describe the bug
One of our tests changed its behavior after upgrading up to Spark 3.x.
The original comment is located here #3294 (comment)
This issue is to track down the root cause of the behavior change, explain it and fix if necessary.
To Reproduce
$ ./sbt
$ project spark
$ testOnly geotrellis.spark.summary.StatsTileRDDMethodsSpec -- -z "should be able to sample a fraction of an RDD to compute a histogram"
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