Github user gatorsmile commented on a diff in the pull request:
    --- Diff: 
sql/core/src/test/scala/org/apache/spark/sql/DataFrameNaFunctionsSuite.scala ---
    @@ -261,5 +261,37 @@ class DataFrameNaFunctionsSuite extends QueryTest with 
SharedSQLContext {
         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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