zero323 commented on a change in pull request #33853:
URL: https://github.com/apache/spark/pull/33853#discussion_r699274062
##########
File path: sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala
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@@ -2491,6 +2502,16 @@ class Dataset[T] private[sql](
}
}
+ /**
+ * Returns a new Dataset by updating an exisitng column with metadata.
+ *
+ * @group untypedrel
+ * @since 3.3.0
+ */
+ def withMetadata(existingColumnName: String, metadata: Metadata): DataFrame
= {
+ withColumn(existingColumnName, col(existingColumnName), metadata)
Review comment:
It would be nice to know the motivation here (maybe we can start with a
JIRA ticket?). Adding metadata with `as` (`alias` in Python) is a bit verbose /
repetitive but it is not that common operation anyway.
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