Github user yhuai commented on the pull request:
https://github.com/apache/spark/pull/13128#issuecomment-220411852
All Spark confs are not mutable. For SQL, those metastore related confs are
also not mutable considering the long-running metastore client that we have. I
do think it is reasonable to explicitly mark `spark.sql.warehouse.dir` as not
mutable. We can make it clear in our doc (for example, have a list of immutable
confs of SQL in Spark SQL programming guide). If we want to throw exceptions,
it will be good to consider both Spark conf and immutable SQL confs together.
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