Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/20484
@dongjoon-hyun What we need to add in the migration guide is to help the
existing ORC users migrate their existing queries that are built on ORC tables.
The Hive ORC confs can be set in the hiveconf? the table properties? the
serde properties (our options)? Are they still working after we
implicitly/automatically convert them to use our new ORC reader? If not, we
need to documents them. This also answers the questions by @tgravescs in the
JIRA.
I knew there are a few conf-related bugs. It might be too late to fix them
in the RC of 2.3 release, but we have to identify and document them. Thanks for
your works!
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