cloud-fan commented on a change in pull request #32301:
URL: https://github.com/apache/spark/pull/32301#discussion_r619296928
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/NestedColumnAliasing.scala
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@@ -30,54 +30,61 @@ import org.apache.spark.sql.types._
*/
object NestedColumnAliasing {
Review comment:
I think a good first step is to improve the classdoc to explain in
detail what we are doing here, with examples.
A good example is `DecorrelateInnerQuery`.
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