Github user hhbyyh commented on the pull request:
https://github.com/apache/spark/pull/11078#issuecomment-183636091
Thanks for the review. I tested the change and the max memory dropped from
2.2G to 2G as observed from JConsole. I'll make a new benchmark and post the
details here.
@srowen Removing the flatten did help. Also I think removing the ++ and use
the C style loop helps decrease the max memory consumption.
@mengxr Just personal understanding. Since there's no sequential
intermediate operations. I thought being lazy does not help a lot on saving
memory. Anyway I'll re-verify the improvement.
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