amaliujia commented on code in PR #38023:
URL: https://github.com/apache/spark/pull/38023#discussion_r981760665
##########
connect/src/main/protobuf/spark/connect/expressions.proto:
##########
@@ -155,4 +156,7 @@ message Expression {
string expression = 1;
}
+ // represent * (e.g. SELECT *)
+ message UnresolvedStar {
+ }
Review Comment:
We need to expand this message later to support full fields of the star:
```
case class UnresolvedStar(target: Option[Seq[String]]) extends Star with
Unevaluable {
```
which is will be used to support `Struct`.
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