Github user windpiger commented on the issue:
https://github.com/apache/spark/pull/16672
If we create the location path when alter table by user A, maybe we use
user B to run the job which have no permission to write data to the location,
is't it also not friendly? Maybe throw an runtime Exception is properly, and
don't create path when alter table.
@gatorsmile @cloud-fan @yhuai @hvanhovell
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