LuciferYang commented on PR #55410:
URL: https://github.com/apache/spark/pull/55410#issuecomment-5493181742

   The failing `pyspark-connect-old-client` check comes from the behavior 
change, not from flakiness. That job runs `branch-4.0`'s `pyspark-connect` 
tests against a server from this build, and `branch-4.0`'s copy of 
`test_nested_dataframes` still reads the batch DataFrame's temp view back 
through the client session. It fails on the `spark.sql` call after 
`processAllAvailable()` returns, so the old client drives the new server to 
completion; only that assertion breaks.
   
   #58446 guards that test on `branch-4.0` with 
`SPARK_SKIP_CONNECT_COMPAT_TESTS`, as SPARK-52077 did for 
`ArrowUDTFParityTests`. It needs to land before this job can go green here.
   


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