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https://issues.apache.org/jira/browse/CASSANDRA-8492?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14552096#comment-14552096
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Aleksey Yeschenko commented on CASSANDRA-8492:
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I'm a bit wary of adding this. It's not crucial, it's not present in Postgres
or MySQL, and it's not mirrored by a matching {{ALTER TABLE DROP COLUMN IF
EXISTS}}.
> 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
> Attachments: 8492.patch
>
>
> would enable creation of schema update scripts that can be repeatable
> executed without having to worry about invalid query exceptions
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