xupefei commented on code in PR #48651:
URL: https://github.com/apache/spark/pull/48651#discussion_r1832731995


##########
python/pyspark/sql/tests/test_connect_compatibility.py:
##########
@@ -60,16 +60,23 @@
     from pyspark.sql.connect.streaming.readwriter import DataStreamReader as 
ConnectDataStreamReader
     from pyspark.sql.connect.streaming.readwriter import DataStreamWriter as 
ConnectDataStreamWriter
 
+SPARK_CONNECT_ONLY = "spark_connect_only"
+
 
 class ConnectCompatibilityTestsMixin:
     def get_public_methods(self, cls):
         """Get public methods of a class."""
-        return {
-            name: method
-            for name, method in inspect.getmembers(cls)
-            if (inspect.isfunction(method) or isinstance(method, 
functools._lru_cache_wrapper))
-            and not name.startswith("_")
-        }
+        methods = {}
+        for name, method in inspect.getmembers(cls):
+            if (
+                inspect.isfunction(method) or isinstance(method, 
functools._lru_cache_wrapper)
+            ) and not name.startswith("_"):
+                source_lines = inspect.getsource(method).upper()
+                if "ONLY_SUPPORTED_WITH_SPARK_CONNECT" in source_lines:

Review Comment:
   How about using a new decorator `@SparkConnectOnly` which doesn't suffer 
from flakiness? So instead of having a list in 
`test_spark_session_compatibility` we now spread the items to their declaration 
sites.
   That would make people more aware of adding such a decorator when needed.



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