Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/12213#issuecomment-206632109
Okay, so it turns out that removing this is going to be kind of tricky
right now because we'd take on the burden of ensuring proper serialization of
Scala `Option` types and, from experience, that's going to become a bit messy.
Therefore, I'm going to fall back on an alternative proposal: I'll take on
the burden of getting jackson-module-scala to run on 2.12 and then will work to
move from a lot of imperative json4s code to Jackson databind
(https://issues.apache.org/jira/browse/SPARK-12141) so that we can eventually
remove json4s and consolidate on Jackson
(https://issues.apache.org/jira/browse/SPARK-14439). Once we've done that, if
it later turns out that we need to remove jackson-module-scala then we can just
absorb / inline whatever portion of it we actually use.
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