Github user gatorsmile commented on a diff in the pull request:

    https://github.com/apache/spark/pull/18820#discussion_r132103945
  
    --- Diff: 
sql/core/src/test/scala/org/apache/spark/sql/DataFrameNaFunctionsSuite.scala ---
    @@ -261,5 +261,37 @@ class DataFrameNaFunctionsSuite extends QueryTest with 
SharedSQLContext {
         assert(out1(3).get(2).asInstanceOf[Double].isNaN)
         assert(out1(4) === Row("Amy", null, null))
         assert(out1(5) === Row(null, null, null))
    +
    +    // Replace String with String and null
    --- End diff --
    
    Create a separate test case 
    ```
    test("replace with null") {
      ...
    }
    ```


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