Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/15515#discussion_r84948916
--- Diff:
sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveExternalCatalog.scala ---
@@ -581,13 +582,30 @@ private[spark] class HiveExternalCatalog(conf:
SparkConf, hadoopConf: Configurat
// Partitions
//
--------------------------------------------------------------------------
+ // Hive metastore is not case preserving and the partition columns are
always lower cased. We need
+ // to lower case the column names in partition specification before
calling partition related Hive
+ // APIs, to match this behaviour.
+ private def lowerCasePartitionSpec(spec: TablePartitionSpec):
TablePartitionSpec = {
--- End diff --
cc @ericl @yhuai, I have isolated these hive partition hacks in
`HiveExternalCatalog`, so that `HiveExternalCatalog` can provides case
preserving partition related interfaces.
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