Github user mallman commented on the issue:
https://github.com/apache/spark/pull/15538
The "CorruptStatistics" stack traces (which I agree are really annoying)
are being logged because parquet logs them at the WARN level, and Spark's
default logging threshold when running tests is WARN.
I've pushed a commit to set the parquet log threshold to ERROR for testing.
This is actually the default configuration for a Spark deployment:
https://github.com/apache/spark/blob/v2.0.1/conf/log4j.properties.template#L35.
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