viirya commented on a change in pull request #31966:
URL: https://github.com/apache/spark/pull/31966#discussion_r619741567
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/NestedColumnAliasing.scala
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@@ -276,6 +276,16 @@ object GeneratorNestedColumnAliasing {
val pushedThrough = Project(NestedColumnAliasing
.getNewProjectList(projectList, nestedFieldsNotOnGenerator),
newChild)
+ // If the generator output is `ArrayType`, we cannot push through
the extractor.
+ // It is because we don't allow field extractor on two-level array,
+ // i.e., attr.field when attr is a ArrayType(ArrayType(...)).
+ // Similarily, we also cannot push through if the child of generator
is `MapType`.
+ g.generator.children.head.dataType match {
Review comment:
Thank you!
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