Github user budde commented on the issue:
https://github.com/apache/spark/pull/16744
So, if these values are ```null``` we'll still be passing them to construct
a ```BasicCredentialsProvider``` to pass as
```STSCredentialsProvider.longLivedCredentialsProvider```. I could add a check
to use ```DefaultCredentialsProvider``` if these params are ```null```. It
wouldn't be very good Scala style but perhaps this isn't much of a concern if
we aren't expecting this to really be used much.
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