Github user bhaisaab commented on the pull request:
https://github.com/apache/cloudstack/pull/768#issuecomment-161539427
@remibergsma we should not have the alter statement both in sql file and
the Java upgrade path. Since the putting it in SQL might throw exceptions
causing the upgrade path execution to abort (in case of an existing column), we
decided to put in the Java upgrade class with a try-catch (in case of an
existing column, we simply ignore it).
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