windmark commented on issue #26561:
URL: https://github.com/apache/airflow/issues/26561#issuecomment-1253927522

   The issue is that the primary key name `pk_xcom` isn't passed explicitly as 
an argument and the pk thus takes the name of the temporary table 
`__airflow_tmp_xcom_pkey`. This is for some reason handled in `mssql` but not 
for example in Postgres that I'm using.
   
   I'm however not sure how Airflow handles bugs in migrations, with 
backporting to already released versions. Otherwise I can help out fix the 
issue.


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