Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/7191#issuecomment-125759747
Yeah the issue is that the `hive-exec` jar in upstream hive is actually an
assembly jar that includes guava and a bunch of other things. This causes
dependency conflicts that are basically impossible to fix, since those packages
aren't isolated to their own jar.
https://issues.apache.org/jira/browse/HIVE-5733
They fixed this in Hive 1.2, by adding a new `hive-exec` under a classifier
"core" that doesn't include them. We need to make sure we are using that
variant of hive-exec. Currently Spark depends on a forked version of hive 13
that modifies the hive-exec jar to not be an assembly jar.
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