patricker opened a new pull request, #26768:
URL: https://github.com/apache/airflow/pull/26768

   related: #26283 
   closes: #26767
   
   The `max_id_key ` parameter, when used, causes an XCom serialization failure 
when trying to retrieve the value back out of XCom. This is because instead of 
storing a single column value in XCom, we were accidentally storing the entire 
Row.
   
   The Unit Test was updated to reflect the return type of 
`get_job().result()`. This operation actually returns a Row iterator, but 
returning an array of `Row` works well for the test.


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