dongjoon-hyun commented on a change in pull request #29191:
URL: https://github.com/apache/spark/pull/29191#discussion_r458936940
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File path: sql/core/src/main/scala/org/apache/spark/sql/DataFrameWriter.scala
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@@ -288,7 +288,7 @@ final class DataFrameWriter[T] private[sql](ds: Dataset[T])
{
val provider = maybeV2Provider.get
val sessionOptions = DataSourceV2Utils.extractSessionConfigs(
provider, df.sparkSession.sessionState.conf)
- val options = sessionOptions ++ extraOptions
+ val options = sessionOptions ++ extraOptions.originalMap
val dsOptions = new CaseInsensitiveStringMap(options.asJava)
Review comment:
I missed that `dsOptions.asCaseSensitiveMap()` is used later at line
303, `extraOptions.originalMap` will preserve the key case-sensitivity.
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