Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/22365#discussion_r217256279
--- 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 --
I'm +1 for it, but we probably need to send a email to dev list to get more
feedbacks.
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