Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/7957#discussion_r36938476
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/DataFrame.scala ---
@@ -1135,17 +1135,18 @@ class DataFrame private[sql](
* @group dfops
* @since 1.3.0
*/
- def withColumn(colName: String, col: Column): DataFrame = {
+ def withColumn(colName: String, col: Column, metadata: Option[Metadata]
= None): DataFrame = {
--- End diff --
cc @rxin , in MLlib sometimes we need to set metadata for the new column,
thus we will alias the new column with metadata before call `withColumn` and in
`withColumn` we alias this clolumn again. Here I added a new parameter to allow
user set metadata.
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