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https://issues.apache.org/jira/browse/CASSANDRA-11295?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15231071#comment-15231071
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Henry Manasseh commented on CASSANDRA-11295:
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For the a CQL syntax, how about using a syntax similar to a UDF?
SELECT * FROM ks.t1 WHERE my_custom_filter('some arbitrary constraint to be
applied by custom filter');
> Make custom filtering more extensible via custom classes
> ---------------------------------------------------------
>
> Key: CASSANDRA-11295
> URL: https://issues.apache.org/jira/browse/CASSANDRA-11295
> Project: Cassandra
> Issue Type: Improvement
> Components: Local Write-Read Paths
> Reporter: Sam Tunnicliffe
> Assignee: Sam Tunnicliffe
> Priority: Minor
> Fix For: 3.6
>
>
> At the moment, the implementation of {{RowFilter.CustomExpression}} is
> tightly bound to the syntax designed to support non-CQL search syntax for
> custom 2i implementations. It might be interesting to decouple the two things
> by making the custom expression implementation and serialization a bit more
> pluggable. This would allow users to add their own custom expression
> implementations to experiment with custom filtering strategies without having
> to patch the C* source. As a minimally invasive first step, custom
> expressions could be added programmatically via {{QueryHandler}}. Further
> down the line, if this proves useful and we can figure out some reasonable
> syntax we could think about adding the capability in CQL in a separate
> ticket.
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