Github user felixcheung commented on the issue:
https://github.com/apache/spark/pull/17941
@rxin it was from a while back in SPARK-17865
essentially these are exactly the same in standalone SparkR:
```
sparkR.session()
...
createGlobalTempView(df, "foo")
sparkR.session.stop()
```
same as
```
sparkR.session()
...
createOrReplaceTempView(df, "foo")
sparkR.session.stop()
```
this is because in SparkR, `SparkContext` is stopped the same time as
`SparkSession` (and there is only one session at a time)
so I think it makes sense to formally support the idea of the "global
session" as discussed in SPARK-17865; with some changes in session
initialization and session termination, and R session cleanup, plus more
documentation and proper testing of global view lifetime beyond session, it
should be good to have.
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