Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/14897
@gatorsmile That's a good question, if users are using a SQL shell, there
is no way for them to figure out the global temp database.
But including global temp database in SHOW DATABASES doesn't solve the
problem, users still don't know which database is the global temp database.
My proposal: after read the `spark.sql.globalTempDatabase`, we set it to
SparkConf, and mark it as unsetable(if we can), then uses can read this conf to
know the global temp database.
cc @yhuai @liancheng
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