cloud-fan commented on code in PR #37165:
URL: https://github.com/apache/spark/pull/37165#discussion_r918640337
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/complexTypeCreator.scala:
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@@ -605,10 +605,16 @@ case class StringToMap(text: Expression, pairDelim:
Expression, keyValueDelim: E
/**
* Represents an operation to be applied to the fields of a struct.
*/
-trait StructFieldsOperation {
+trait StructFieldsOperation extends Expression with Unevaluable {
Review Comment:
The change here is to make sure we can optimize update field expressions
inside `UpdateFields`.
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