Github user kayousterhout commented on the pull request:
https://github.com/apache/spark/pull/4550#issuecomment-74322115
Yeah the reason I didn't add it in the main path is because there, we only
open one file at a time, so the open time tends to be so fast that it's not
even clear we can measure it accurately (it's on the order of tends of
microseconds; this is what's discussed in the JIRA I linked above). I can add
it if you think it's confusing not to have it (or maybe I should just add a
comment in the code?) but because it's so fast, I don't think it makes sense to
add to the time.
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