Github user chenghao-intel commented on a diff in the pull request:
https://github.com/apache/spark/pull/4186#discussion_r23819350
--- Diff: sql/hive/src/main/scala/org/apache/spark/sql/hive/hiveUdfs.scala
---
@@ -321,6 +324,18 @@ 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 MultiAlias(udtf@HiveGenericUdtf(_, _, _), names) =>
--- End diff --
A better idea is to convert the `MultiAlias(udtf@HiveGenericUdtf(_, _, _),
names)` => `HiveGenericUdtf(_, names, _)`? And the `MultiAlias` just like the
`UnresolvedAttribute`, which will be eliminated after `Analyzing`
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