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

    https://github.com/apache/spark/pull/18164#discussion_r119810649
  
    --- Diff: 
sql/core/src/test/scala/org/apache/spark/sql/DataFrameNaFunctionsSuite.scala ---
    @@ -36,6 +36,15 @@ class DataFrameNaFunctionsSuite extends QueryTest with 
SharedSQLContext {
           ).toDF("name", "age", "height")
       }
     
    +  def createBooleanDF(): DataFrame = {
    --- End diff --
    
    It looks this functions is only used once. I think we could just move the 
lines in the functions into the test, "fill".


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