Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/22144
It does try to fix a backward compatibility issue. It is found later now
but still it is true we found a breaking issue to fix. Broken backward
compatibility that potentially affects a set of users (it at least looks
blocking an external Hive UDF library repo) sounds like a blocker to me.
Some of Hive compatibility issues are reported late because IMHO it's a bit
complicated to follow (it requires to take a look for both Hive and Spark at
least).
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