HyukjinKwon commented on a change in pull request #28830:
URL: https://github.com/apache/spark/pull/28830#discussion_r440013368
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File path: sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala
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@@ -2541,7 +2541,9 @@ class Dataset[T] private[sql](
def dropDuplicates(colNames: Seq[String]): Dataset[T] = withTypedPlan {
val resolver = sparkSession.sessionState.analyzer.resolver
val allColumns = queryExecution.analyzed.output
- val groupCols = colNames.distinct.flatMap { (colName: String) =>
+ // SPARK-31990: We must keep `toSet.toSeq` here because of the backward
compatibility issue
+ // (the Streaming's state store depends on the `groupCols` order).
+ val groupCols = colNames.toSet.toSeq.flatMap { (colName: String) =>
Review comment:
Ah, that was fixed in a way by adding an env variable. That case also
was specific to Python 2 which is deprecated now so it's rather a corner case.
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