Github user mridulm commented on the pull request:
https://github.com/apache/spark/pull/266#issuecomment-40273651
I think we can replace it with a custom impl - where we decide that it is
ok to "waste" some memory within some threshold in case the copy is much more
expensive - particularly given that most of this is almost immediately used and
thrown away.
For example, if the size > X bytes and wastage (capacity - size) < Y% of
capacity.
What we save from reallocating and compaction is not worth the effort.
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