Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/4847#discussion_r25584861
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/DataFrame.scala ---
@@ -337,11 +337,11 @@ class DataFrame protected[sql](
* {{{
* // Scala:
* import org.apache.spark.sql.functions._
- * df1.join(df2, "outer", $"df1Key" === $"df2Key")
+ * df1.join(df2, $"df1Key" === $"df2Key", "outer")
*
* // Java:
* import static org.apache.spark.sql.functions.*;
- * df1.join(df2, "outer", col("df1Key") === col("df2Key"));
+ * df1.join(df2, col("df1Key") === col("df2Key"), "outer");
--- End diff --
actually while you are at it, do you mind fixing the java example? it
definitely wouldn't work with col("df1key") === col("df2key").
I think you need col("df1Key").equalTo(col("df2Key"))
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