Github user dongjoon-hyun commented on a diff in the pull request:
https://github.com/apache/spark/pull/15863#discussion_r87700361
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/DataSource.scala
---
@@ -314,8 +311,7 @@ case class DataSource(
catalogTable.get,
catalogTable.get.stats.map(_.sizeInBytes.toLong).getOrElse(0L))
} else {
- new InMemoryFileIndex(
- sparkSession, globbedPaths, options, partitionSchema)
+ new InMemoryFileIndex(sparkSession, globbedPaths, options,
partitionSchema)
--- End diff --
`InMemoryFileIndex` should use the original one because it extends
`PartitioningAwareFileIndex` which uses the following line.
```scala
protected val hadoopConf =
sparkSession.sessionState.newHadoopConfWithOptions(parameters)
```
Eventually, it created another **case-sensitive** Map from the
`CaseInsensitiveMap`. In that case, it will fail to retrieve data from that map
because the key value is changed as lowercases already in `CaseInsensitiveMap`.
```scala
def newHadoopConfWithOptions(options: Map[String, String]): Configuration =
{
val hadoopConf = newHadoopConf()
options.foreach { case (k, v) =>
if ((v ne null) && k != "path" && k != "paths") {
hadoopConf.set(k, v)
}
}
hadoopConf
}
```
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