Github user yhuai commented on the pull request:
https://github.com/apache/spark/pull/9664#issuecomment-156232331
@marmbrus Hive UDFs stored in metastore is a harder problem. For those
functions, we need to talk to metadataHive. But, when we do function lookup, we
do not know which metastore to search. Maybe we can first try executionHive and
if it failed, we try metadataHive.
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