cloud-fan commented on code in PR #39068:
URL: https://github.com/apache/spark/pull/39068#discussion_r1051940915
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connector/connect/common/src/main/protobuf/spark/connect/expressions.proto:
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@@ -167,4 +169,26 @@ message Expression {
// (Optional) Alias metadata expressed as a JSON map.
optional string metadata = 3;
}
+
+ message LambdaFunction {
+ // (Required) The lambda function.
+ Expression function = 1;
+
+ // (Required) Function arguments. Must not be empty.
+ //
+ // All arguments must be UnresolvedNamedLambdaVariables.
+ repeated Expression arguments = 2;
Review Comment:
Shall we simply use `repeated String ...`? If we think about the SQL API
`exists(array_col, c -> ...)`, what we need to provide here is the argument
name list, which is really just a list of string.
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