Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/5638#discussion_r28912783
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/DataFrame.scala ---
@@ -343,6 +343,35 @@ class DataFrame private[sql](
}
/**
+ * Inner equi-join with another [[DataFrame]] using the column.
+ * {{{
+ * // Joining df1 and df2 using the column "user_id"
+ * df1.join(df2, "user_id")
+ * }}}
+ *
--- End diff --
I would also state that similar to SQL USING the join column will only
appear once in the output.
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