amaliujia commented on PR #38793:
URL: https://github.com/apache/spark/pull/38793#issuecomment-1327980390
I pushed a commit to use `Alias` but now I know why I have been having a
sense of the different semantics:
```
message Alias {
Expression expr = 1;
repeated string name = 2;
// Alias metadata expressed as a JSON map.
optional string metadata = 3;
}
```
Alias has a list of name parts while WithColumn assumes one name part (a
single string). Right now I just assume there is one name part passed from the
Alias messages.
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