Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/14638
I think this is really an uncommon hive feature, and users can work around
it by creating an external data source table on the CSV files.
And another concern is, we can't simply call some Hive APIs, but have to
reimplement this feature at Spark side(in the hive table reader). If there are
more Hive features like this, we will complicate the hive table reader quite a
bit.
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