Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/4200#issuecomment-71432272
Th evaluation of this criteria seems correct, but this isn't the solution,
I think. As you approach this limit, you're allocating a single ~16GB array.
This is already at the kind of scale where this implementation is not
sufficient. Therefore should the code not select the distributed version in
this case, rather than just fail?
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