Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/10184#discussion_r46992054
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala ---
@@ -429,18 +432,18 @@ class Dataset[T] private[sql](
/**
* (Java-specific)
- * Returns a [[GroupedDataset]] where the data is grouped by the given
key function.
+ * Returns a [[GroupedDataset]] where the data is grouped by the given
key `func`.
* @since 1.6.0
*/
- def groupBy[K](f: MapFunction[T, K], encoder: Encoder[K]):
GroupedDataset[K, T] =
- groupBy(f.call(_))(encoder)
+ def groupBy[K](func: MapFunction[T, K], encoder: Encoder[K]):
GroupedDataset[K, T] =
--- End diff --
A note: this is fine since RC1 failed, but we can't make these kinds of
changes in the future as they break compatibility.
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