Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/15566
I have changed it to `This PR makes partition spec case preserving at
parser`, sorry for the confusion.
Previously we were lazy and alway lower case the column names in partition
spec. In other partition related operations, we search partition columns by
`==` directly, without considering case sensitivity. It's fine as we only
support partition related operations for hive tables and hive tables are not
case-preserving. However, if we are going to support partition operations for
data source tables, we can't assume the partition columns are always lower
cased in metastore and lower case the partition spec at parser.
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