Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/9274#issuecomment-151004298
/cc @kayousterhout @markhamstra, this seems like a potentially easy win for
reducing driver memory consumption when performing a write that outputs
millions of partitions. This isn't necessarily a huge amount of memory savings,
but it's a substantial reduction in the number of map entry objects created,
which could have GC benefits.
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