Github user HyukjinKwon commented on a diff in the pull request: https://github.com/apache/spark/pull/18820#discussion_r131535507 --- Diff: sql/core/src/test/scala/org/apache/spark/sql/DataFrameNaFunctionsSuite.scala --- @@ -248,16 +248,16 @@ class DataFrameNaFunctionsSuite extends QueryTest with SharedSQLContext { assert(out(4) === Row("Amy", null, null)) assert(out(5) === Row(null, null, null)) - // Replace only the age column - val out1 = input.na.replace("age", Map( + // Replace only the age column and with null + val out1 = input.na.replace("age", Map[Any, Any]( --- End diff -- How about rather adding a separate test and leaving the existing test as is?
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