Github user gatorsmile commented on a diff in the pull request:
    --- 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 --
    Do not put it here. It should be put in @parm. 

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