grundprinzip commented on code in PR #38800:
URL: https://github.com/apache/spark/pull/38800#discussion_r1034096732
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connector/connect/src/main/protobuf/spark/connect/expressions.proto:
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@@ -40,37 +40,34 @@ message Expression {
message Literal {
oneof literal_type {
Review Comment:
This only works in Scala because of the inherited type hierarchy, the
ability of an Any type and deferring the necessary apply / unaply methods.
Since proto does not have this imperative concept of inheritance, we need to
embed the physical type with the logical one.
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