Github user ueshin commented on a diff in the pull request: https://github.com/apache/spark/pull/21990#discussion_r225811960 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/SparkSession.scala --- @@ -1136,4 +1121,27 @@ object SparkSession extends Logging { SparkSession.clearDefaultSession() } } + + /** + * Initialize extensions if the user has defined a configurator class in their SparkConf. + * This class will be applied to the extensions passed into this function. + */ + private[sql] def applyExtensionsFromConf(conf: SparkConf, extensions: SparkSessionExtensions) { --- End diff -- I see, but in that case, we need to ensure that no injection of extensions is used in the default constructor to avoid initializing without extensions from the conf.
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