Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/9364#discussion_r43453259
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/DataFrame.scala ---
@@ -663,6 +667,35 @@ class DataFrame private[sql](
def orderBy(sortExprs: Column*): DataFrame = sort(sortExprs : _*)
/**
+ * Returns a new [[DataFrame]] partitioned by the given partitioning
expressions into
+ * `numPartitions`
+ * `numPartitions` can be < 0 to preserve the current number of
partitions.
+ * @group dfops
--- End diff --
Let's add scaladoc to explain that we are using hash partitioning.
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