Github user viirya commented on the pull request:
https://github.com/apache/spark/pull/3532#issuecomment-67613691
Thanks. I found that `getCallSite` is called in many places. So I am
curious about its implementation details. Then I thought it can be more
efficient. I have not really tested its performance but as we can reduce the
number of times of visiting the collection of `StackTraceElement`. It should be
faster slightly.
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