Github user felixcheung commented on the issue:
https://github.com/apache/spark/pull/17731
so essentially it's still evaluating the `get` before when the 2nd `get` is
hit from the delay binding (as a way to prevent going into an infinite loop,
really)
what if you have this instead to break the loop?
```
delayAssign(delayedAssign(".sparkRsession",
{ rm(".sparkRsession", envir = SparkR:::.sparkREnv); sparkR.session(..) },
assign.env=SparkR:::.sparkREnv)
```
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