[GitHub] [james-project] chibenwa edited a comment on pull request #464: JAMES-3576 Further denormalize message table

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chibenwa edited a comment on pull request #464:
URL: https://github.com/apache/james-project/pull/464#issuecomment-856499755


   > However, usually when we want to add changes to tables, instead of introducing breaking changes, don't we recreate the table in a new version? 
   
   This is the strategy we adopted so far however:
    - it generate too much tables and table are expensive with Cassandra 
    - generating double the message reads during the migration would be a major performance hit
   
   For this specific case I think `ALTER TABLE` is simpler and safer.
   
   > I wouldn't be too surprised of people in the community breaking their db because they didn't read or read too quickly the upgrade notes...
   
   Query preparation would prevent James to start. Nothing to be worried of.


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