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Sachin Janani commented on CASSANDRA-8492:
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Hi All,
I am taking up this jira will upload a patch soon.
> Support "IF NOT EXISTS" for "ALTER TABLE ADD COLUMN"
> ----------------------------------------------------
>
> Key: CASSANDRA-8492
> URL: https://issues.apache.org/jira/browse/CASSANDRA-8492
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Peter Mädel
> Priority: Minor
>
> would enable creation of schema update scripts that can be repeatable
> executed without having to worry about invalid query exceptions
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