Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/16970#discussion_r102378877
--- 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 {
val resolver = sparkSession.sessionState.analyzer.resolver
val allColumns = queryExecution.analyzed.output
- val groupCols = colNames.flatMap { colName =>
+ val groupCols = colNames.toSet.toSeq.flatMap { (colName: String) =>
--- End diff --
was this a bug with batch queries as well? and what would the result be
without this fix?
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