Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/6107#discussion_r30283304
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/Column.scala ---
@@ -616,6 +616,17 @@ class Column(protected[sql] val expr: Expression)
extends Logging {
def as(alias: String): Column = Alias(expr, alias)()
/**
+ * Assigns the given aliases to the results of a table generating
function.
+ * {{{
+ * // Renames colA to colB in select output.
+ * df.select(explode($"myMap").as("key" :: "value" :: Nil))
+ * }}}
+ *
+ * @group expr_ops
+ */
+ def as(aliases: Seq[String]): Column = MultiAlias(expr, aliases)
--- End diff --
MultiAlias can be used for any table generating function (and others can
already be called using callUDF) so we will have to defer the check to the
analyzer (where we already do it).
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at [email protected] or file a JIRA ticket
with INFRA.
---
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
