Github user BryanCutler commented on the issue: https://github.com/apache/spark/pull/21013 The code changes are pretty much done, but I hit a regression in Python regarding conversion of `DecimalType` with `None` values. I filed to https://issues.apache.org/jira/browse/ARROW-2432 to fix it. Putting this up as a WIP for now, but we might want to think about holding off on the upgrade for now.
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