Github user rxin commented on a diff in the pull request: https://github.com/apache/spark/pull/15994#discussion_r89662083 --- Diff: project/MimaExcludes.scala --- @@ -529,6 +529,7 @@ object MimaExcludes { ProblemFilters.exclude[IncompatibleMethTypeProblem]("org.apache.spark.mllib.evaluation.MulticlassMetrics.this"), ProblemFilters.exclude[IncompatibleMethTypeProblem]("org.apache.spark.mllib.evaluation.RegressionMetrics.this"), ProblemFilters.exclude[IncompatibleMethTypeProblem]("org.apache.spark.sql.DataFrameNaFunctions.this"), + ProblemFilters.exclude[IncompatibleMethTypeProblem]("org.apache.spark.sql.DataFrameNaFunctions.fill"), --- End diff -- The thing is they are not backward compatible at bytecode level, so applications will break if they are not rebuilt.
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