Github user zero323 commented on a diff in the pull request: https://github.com/apache/spark/pull/14517#discussion_r103134846 --- Diff: python/pyspark/sql/readwriter.py --- @@ -747,16 +800,25 @@ def _test(): except py4j.protocol.Py4JError: spark = SparkSession(sc) + seed = int(time() * 1000) --- End diff -- @HyukjinKwon By all means. I prepared a bunch of tests (7d911c647f21ada7fb429fd7c1c5f15934ff8847) and extended a bit code provided by @GregBowyer (72c04a3f196da5223ebb44725aa88cffa81036e4). I think we can skip low level tests (direct access to the files) which are already present in Scala test base.
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