Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/16970#discussion_r102572126
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala ---
@@ -1996,7 +1996,7 @@ class Dataset[T] private[sql](
def dropDuplicates(colNames: Seq[String]): Dataset[T] = withTypedPlan {
--- End diff --
you have not updates docs for dropDuplicates! You should at least point to
withWatermark to limit the state, and mention its semantics (all data later
than watermark will be ignored).
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