Github user kiszk commented on the issue:
https://github.com/apache/spark/pull/19940
Got it. It seems to be . I have two questions.
1. Is this mutable? It looks it is global, but immutable. IIUC, is there
any other better API name?
2. As @viirya pointed out
[here](https://github.com/apache/spark/pull/19940#issuecomment-350724536), why
don't we declare `final`?
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