Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/16970#discussion_r102381390
--- 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 to add more documentation for streaming usage! especially you have
to document that this will keep all past data as intermediate state, and you
can use the `withWatermark` to limit how late the duplicate data can be and
system will accordingly limit the state.
Also, double the docs on withWatermark and make sure its consistent.
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