Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/11798#issuecomment-198201906
@yy2016 Updated commit message:
> PR #11696 introduced a complex pattern match that broke Scala 2.10 match
unreachability check and caused build failure. This PR fixes this issue by
expanding this pattern match into several simpler ones.
>
> Note that tuning or turning off `-Dscalac.patmat.analysisBudget` doesn't
work for this case.
>
> Compilation against Scala 2.10
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