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https://issues.apache.org/jira/browse/CASSANDRA-8335?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14216689#comment-14216689
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Philip Thompson commented on CASSANDRA-8335:
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There was a discussion on the user mailing list where it was requested, but it
seemed like the main complaint was that without this, UPDATE and INSERT are
insufficiently orthogonal. As Sylvain stated though, UPDATE and INSERT are not
intended to be fully orthogonal.
> Support CAS with UPDATE...IF col=val OR NOT EXISTS
> --------------------------------------------------
>
> Key: CASSANDRA-8335
> URL: https://issues.apache.org/jira/browse/CASSANDRA-8335
> Project: Cassandra
> Issue Type: New Feature
> Components: Core
> Reporter: Robert Stupp
> Priority: Minor
> Labels: cas, cql
>
> On the -dev mailing list the RFE to extend UPDATE LWT using something like
> {{UPDATE ... IF col=val ... OR NOT EXISTS}}
> RFE is to add the {{OR NOT EXISTS}} which means either the the {{IF}}
> conditions are met *xor* the row does not exist.
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