Github user felixcheung commented on the issue:
https://github.com/apache/spark/pull/17941
there are several different ways to share context or `SparkSession` between
languages and I think that discussion is orthogonal to the global session.
is there value having temp view in global session? do temp views in global
session disappear when the SparkContext is stopped? that was my understanding
earlier and I offered in SPARK-17865 several different approaches where the
global session would make sense in that case. otherwise since SparkR itself
shutdown both SparkSession and SparkContext together, I think it will be very
confusing to introduce an API that "does not work" in the SparkR package.
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