Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/8600#discussion_r38809139
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/DataFrame.scala ---
@@ -480,10 +480,11 @@ class DataFrame private[sql](
*
* @param right Right side of the join operation.
* @param usingColumns Names of the columns to join on. This columns
must exist on both sides.
+ * @param joinType One of: (default)`inner`, `outer`, `left_outer`,
`right_outer`, `leftsemi`.
* @group dfops
* @since 1.4.0
*/
- def join(right: DataFrame, usingColumns: Seq[String]): DataFrame = {
+ def join(right: DataFrame, usingColumns: Seq[String], joinType: String =
"inner"): DataFrame = {
--- End diff --
We cannot use default parameter values in order to maintain compatibility
with Java. You can add an extra method.
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