Github user HyukjinKwon commented on a diff in the pull request: https://github.com/apache/spark/pull/22365#discussion_r217257137 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/DataFrameStatFunctions.scala --- @@ -370,29 +370,76 @@ final class DataFrameStatFunctions private[sql](df: DataFrame) { * @since 1.5.0 */ def sampleBy[T](col: String, fractions: Map[T, Double], seed: Long): DataFrame = { --- End diff -- Will probably send an email after 2.4.0 since it's not going to be super urgent.
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