grundprinzip commented on code in PR #38631:
URL: https://github.com/apache/spark/pull/38631#discussion_r1021214764
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connector/connect/src/main/protobuf/spark/connect/expressions.proto:
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@@ -170,6 +170,8 @@ message Expression {
message Alias {
Expression expr = 1;
- string name = 2;
+ repeated string name = 2;
+ // Alias metadata expressed as a JSON map.
+ optional string metadata = 3;
Review Comment:
That's a very good question. I think in this case it's not as easy possible
because it actually depends on the type and is not a plain `map<string, string>`
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