Github user markhamstra commented on the pull request:
https://github.com/apache/spark/pull/12060#issuecomment-218945792
@zzcclp Not likely. This PR shouldn't produce any different results, but
rather produces the same results faster. We're typically very conservative
with patch-level releases, so the optimization work for this PR will almost
certainly only appear in the Spark 2.x series. That's not too far off.
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