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https://issues.apache.org/jira/browse/CASSANDRA-11424?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15364306#comment-15364306
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Sylvain Lebresne commented on CASSANDRA-11424:
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Actually, I didn't think straight. If you care about preparing the query, you
probably don't know the column you are interested in advance, so it doesn't
help so much.
> Add support to "unset" JSON fields in prepared statements
> ---------------------------------------------------------
>
> Key: CASSANDRA-11424
> URL: https://issues.apache.org/jira/browse/CASSANDRA-11424
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Ralf Steppacher
>
> CASSANDRA-7304 introduced the ability to distinguish between {{NULL}} and
> {{UNSET}} prepared statement parameters.
> When inserting JSON objects it is not possible to profit from this as a
> prepared statement only has one parameter that is bound to the JSON object as
> a whole. There is no way to control {{NULL}} vs {{UNSET}} behavior for
> columns omitted from the JSON object.
> Please extend on CASSANDRA-7304 to include JSON support.
> {color:grey}
> (My personal requirement is to be able to insert JSON objects with optional
> fields without incurring the overhead of creating a tombstone of every column
> not covered by the JSON object upon initial(!) insert.)
> {color}
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