Github user bravo-zhang commented on a diff in the pull request: https://github.com/apache/spark/pull/18820#discussion_r131814746 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/DataFrameNaFunctions.scala --- @@ -314,6 +316,7 @@ final class DataFrameNaFunctions private[sql](df: DataFrame) { * (Scala-specific) Replaces values matching keys in `replacement` map. * Key and value of `replacement` map must have the same type, and * can only be doubles, strings or booleans. + * `replacement` map value can have null. --- End diff -- The original comments put many **@param** up here. I will fix those as well.
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