xinrong-meng commented on code in PR #39585:
URL: https://github.com/apache/spark/pull/39585#discussion_r1082079721


##########
connector/connect/common/src/main/protobuf/spark/connect/expressions.proto:
##########
@@ -217,6 +219,19 @@ message Expression {
     bool is_user_defined_function = 4;
   }
 
+  message PythonFunction {
+    bytes command = 1;
+  }
+
+  message PythonUDF {
+    string function_name = 1;
+    PythonFunction function = 2;
+    string output_type = 3;
+    repeated Expression arguments = 4;
+    int32 eval_type = 5;
+    bool deterministic = 6;
+  }
+

Review Comment:
   Is there a specific reason we tag `PythonUDF ` to be `5` rather than `4`? Do 
we intentionally leave it for ScalaUDF under development?



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