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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