Github user srowen commented on the issue:
https://github.com/apache/spark/pull/15713
It leads to a bigger memory footprint because of the extra elements that
may be allocated but unused in the array? and the performance win is probably
avoiding those branches? I could believe it.
But then there's little point to this class. Reading the original problem
statement, I wonder why it wasn't easier to just allocate an ArrayBuffer with a
small initial capacity?
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