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https://issues.apache.org/jira/browse/CASSANDRA-4736?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13773691#comment-13773691
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Jonathan Ellis commented on CASSANDRA-4736:
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My point is that the performance difference between {{SELECT foo}} and {{SELECT
exists(foo)}} is small, unless foo is a blob.
> Cassandra should expose a native existence check API
> ----------------------------------------------------
>
> Key: CASSANDRA-4736
> URL: https://issues.apache.org/jira/browse/CASSANDRA-4736
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: sankalp kohli
> Priority: Minor
> Labels: features
>
> Currently Cassandra does not have an existence check API. Because of this,
> data needs to be read and thats how you know whether data is present or not.
> This is not optimal because one replica needs to provide data. Instead a new
> API could be exposed where each replica only sends out hash of the data.
> Repairs and other stuff can happen like a normal read call.
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