Github user hhbyyh commented on the pull request:
https://github.com/apache/spark/pull/3997#issuecomment-70224754
Oh I didn't see your comment before the PR. @mengxr I surely found a lot of
the code using the pattern (first assign locally, then access) in Spark, and we
can follow it.
Just to be honest, I'm not sure I completely understand the reason, is it
for sparing a memory addressing? I ran some local perf test and got no obvious
difference. Would you please share some insight? Thanks a lot!
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