zhengruifeng commented on code in PR #40896:
URL: https://github.com/apache/spark/pull/40896#discussion_r1177334616


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connector/connect/common/src/main/protobuf/spark/connect/expressions.proto:
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@@ -333,6 +333,9 @@ message PythonUDF {
   bytes command = 3;
   // (Required) Python version being used in the client.
   string python_ver = 4;
+  // (Optional) Whether this PythonUDF should be executed in barrier mode.

Review Comment:
   Since this barrier udf is only used to integrate other ML frameworks 
(pytorch for now, will support xgboost in the future), so I guess it can be 
python only.



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