dongjoon-hyun commented on a change in pull request #29160:
URL: https://github.com/apache/spark/pull/29160#discussion_r458619294
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File path: sql/core/src/main/scala/org/apache/spark/sql/DataFrameReader.scala
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@@ -114,7 +114,7 @@ class DataFrameReader private[sql](sparkSession:
SparkSession) extends Logging {
* @since 1.4.0
*/
def option(key: String, value: String): DataFrameReader = {
- this.extraOptions += (key -> value)
Review comment:
Yes. It doesn't work, because `CaseInsensitiveMap.+` operator is
designed to return `Map` instead of `CaseInsensitiveMap`.
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