zhengruifeng commented on code in PR #39451:
URL: https://github.com/apache/spark/pull/39451#discussion_r1064073724
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connector/connect/common/src/main/protobuf/spark/connect/relations.proto:
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@@ -211,6 +211,11 @@ message SetOperation {
// Only UNION supports this option.
optional bool by_name = 5;
+ // (Optional) If to perform the Set operation and allow missing columns.
Review Comment:
happen to find that there is an abstract class `SetOperation` in scala, but
`Union` is not its subclass
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