Github user MLnick commented on the issue: https://github.com/apache/spark/pull/20363 `SPARK-20047` was in 2.2 (and mentioned in the previous highlights). We could also mention `SPARK-20619` but I've tried to limit the list. I checked through the issues for 2.3 and couldn't find any breaking changes. Ping me if anyone knows of any I missed.
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