HyukjinKwon commented on code in PR #46300:
URL: https://github.com/apache/spark/pull/46300#discussion_r1586986177


##########
python/pyspark/sql/connect/udf.py:
##########
@@ -148,15 +150,35 @@ def __init__(
             )
 
         self.func = func
-        self.returnType: DataType = (
-            UnparsedDataType(returnType) if isinstance(returnType, str) else 
returnType
-        )
+        self._returnType = returnType
+        self._returnType_placeholder: Optional[DataType] = None
         self._name = name or (
             func.__name__ if hasattr(func, "__name__") else 
func.__class__.__name__
         )
         self.evalType = evalType
         self.deterministic = deterministic
 
+    @property
+    def returnType(self) -> DataType:

Review Comment:
   Yes, it is. I think it's fine 



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