Github user adrian-ionescu commented on the issue:
https://github.com/apache/spark/pull/18159
[Here](https://gist.github.com/adrian-ionescu/bc68783e01071419ec483bd8216757e8#file-gistfile1-txt-L20)'s
a small test that shows that your `writingTime` metric actually includes the
whole query processing time. It would be more useful if it only showed actual
write time.
I suggest you just wrap calls to `currentWriter.write()` from
`FileFormatWriter.scala`, where you've already added some instrumentation.
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