cloud-fan commented on code in PR #38888:
URL: https://github.com/apache/spark/pull/38888#discussion_r1045387096
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/unresolved.scala:
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@@ -650,11 +650,17 @@ case object UnresolvedSeed extends LeafExpression with
Unevaluable {
* An intermediate expression to hold a resolved (nested) column. Some rules
may need to undo the
* column resolution and use this expression to keep the original column name.
*/
-case class TempResolvedColumn(child: Expression, nameParts: Seq[String])
extends UnaryExpression
+case class TempResolvedColumn(
+ child: Expression,
+ nameParts: Seq[String],
+ hasTried: Boolean = false) extends LeafExpression
with Unevaluable {
+ // If it has been tried to be resolved but failed, mark it as unresolved so
that other rules can
+ // try to resolve it again.
Review Comment:
Yes, I'll update the classdoc later. Now this expression can be used to undo
column resolution, or redo it with a different priority.
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