Github user ueshin commented on a diff in the pull request: https://github.com/apache/spark/pull/18732#discussion_r143614190 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/RelationalGroupedDataset.scala --- @@ -435,6 +435,35 @@ class RelationalGroupedDataset protected[sql]( df.logicalPlan.output, df.logicalPlan)) } + + /** + * Applies a vectorized python use-defined function to each group of data. --- End diff -- nit: `use-defined` -> `user-defined`
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