dongjoon-hyun commented on a change in pull request #34845:
URL: https://github.com/apache/spark/pull/34845#discussion_r766183074
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/NestedColumnAliasing.scala
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@@ -414,6 +409,23 @@ object GeneratorNestedColumnAliasing {
None
}
+ /**
+ * Replace the refernece attribute of extractor expression with generator
input.
+ */
+ private def replaceGenerator(generator: ExplodeBase, expr: Expression):
Expression = {
+ expr.transformDown {
+ case _: Attribute =>
+ generator.child
Review comment:
Since we switch to `transformDown` from `transformUp`, this could be
revisited and transformed? Is it safe from recursion?
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