Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/9226#issuecomment-150941297
I'd also vote for the 2nd approach. PR #9251 doesn't exactly fix "mix case"
`partitionBy`, but simply lowercases all partition columns. Two drawbacks of
this approaches are:
1. Usually Spark SQL always tries to be case preserving, so that we can
adapt to either case sensitive or case insensitive environments. But PR #9251
erases case information
2. This can be confusing, because even when users are working under case
sensitive configuration, partition column names are still erased.
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