Github user srowen commented on the issue:
https://github.com/apache/spark/pull/21596
I'm also concerned about the other direction: this dependency leaks onto
the user classpath, so we'd be updating Jackson for all apps. That is a good
thing in some cases, but probably breaks some other cases. Users can (perhaps
should) be shading Jackson but I bet most won't. This is why it's safe for
Spark 3, risky for Spark 2.4.
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