srowen commented on issue #26797: [SPARK-30166][SQL] Eliminate compilation warnings in JSONOptions URL: https://github.com/apache/spark/pull/26797#issuecomment-563021547 I've kind of lost track of whether deploying on Hadoop 2.7 means it downgrades at runtime somehow, because Hadoop 2.x uses an older version. It evidently doesn't cause test failures at least. I really don't have a specific case for you why it won't work, but just know this has been troublesome in the past and so I just haven't touched Jackson if not necessary. @steveloughran , eh, any thoughts on the state of Jackson in Hadoop?
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