Github user andrewor14 commented on a diff in the pull request: https://github.com/apache/spark/pull/12877#discussion_r61958574 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala --- @@ -211,7 +211,7 @@ class Dataset[T] private[sql]( private implicit def classTag = unresolvedTEncoder.clsTag - def sqlContext: SQLContext = sparkSession.wrapped + lazy val sqlContext: SQLContext = sparkSession.wrapped --- End diff -- also please add a comment explaining that it must be a val because stable identifier is expected when you import the implicits
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