Github user chenghao-intel commented on a diff in the pull request:
https://github.com/apache/spark/pull/4186#discussion_r23509410
--- Diff: sql/hive/src/main/scala/org/apache/spark/sql/hive/hiveUdfs.scala
---
@@ -321,6 +323,18 @@ private[hive] case class HiveGenericUdtf(
override def toString =
s"$nodeName#${funcWrapper.functionClassName}(${children.mkString(",")})"
}
+/**
+ * Resolve Udtfs Alias.
+ */
+private[spark] object ResolveUdtfsAlias extends Rule[LogicalPlan] {
+ def apply(plan: LogicalPlan) = plan transform {
+ case q: LogicalPlan => q transformExpressions {
+ case Alias(udtf@HiveGenericUdtf(_, _, _), names) if
names.contains("|") =>
+ Alias(udtf.copy(aliasNames = names.split("\\|")), names)()
--- End diff --
I believe this will work, but seems a little hacky to me. A better way
probably is create a new expression node like `MultiAlias`. And since only
single UDTF expression is supported the SELECT clause, we'd better also add a
semantic checking in `analyzer`.
What do you think?
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