[GitHub] [spark] Hisoka-X commented on a diff in pull request #40684: [SPARK-41532][CONNECT][CLIENT] Add check for operations that involve multiple data frames

["Hisoka-X (via GitHub)" <gi...@apache.org>]

Hisoka-X commented on code in PR #40684:
URL: https://github.com/apache/spark/pull/40684#discussion_r1183569839


##########
python/pyspark/sql/connect/dataframe.py:
##########
@@ -249,14 +254,18 @@ def crossJoin(self, other: "DataFrame") -> "DataFrame":
             raise Exception("Cannot cartesian join when self._plan is empty.")
         if other._plan is None:
             raise Exception("Cannot cartesian join when other._plan is empty.")
-
+        self.checkSameSparkSession(other)
         return DataFrame.withPlan(
             plan.Join(left=self._plan, right=other._plan, on=None, how="cross"),
             session=self._session,
         )
 
     crossJoin.__doc__ = PySparkDataFrame.crossJoin.__doc__
 
+    def checkSameSparkSession(self, other: "DataFrame") -> None:
+        if self._session.session_id != other._session.session_id:
+            raise PySparkException("Both Datasets must belong to the same SparkSession")

Review Comment:
   Thanks for remind, I add `SessionNotSameException` for this. Please check.



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