Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/6159#issuecomment-103241644
While fixing this, I found a units / sizing issue: our `longArray` can only
contain Integer.MAX_VALUE elements and each map entry requires two entires in
`longArray`, so our actual maximum capacity (# of supported map elements )
should be Integer.MAX_VALUE / 2. I'm fixing this and adding additional tests
for the various boundary conditions near the maximum size.
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