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https://issues.apache.org/jira/browse/CASSANDRA-8488?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15264523#comment-15264523
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 Brian Hess commented on CASSANDRA-8488:
----------------------------------------

There is a way around CASSANDRA-8273 for UDFs, but it might not be the best 
(though, then again, there doesn't appear to be a solution for 8273).  We could 
not have replica-based filtering if the filter is a UDF.  That is, you will 
bring all rows that meet the *other* filters back to the coordinator and do the 
filtering of the UDF(s) on the replica after ConsistencyLevel is applied.

> Filter by UDF
> -------------
>
>                 Key: CASSANDRA-8488
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8488
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: CQL, Local Write-Read Paths
>            Reporter: Jonathan Ellis
>              Labels: client-impacting, cql, udf
>             Fix For: 3.x
>
>
> Allow user-defined functions in WHERE clause with ALLOW FILTERING.



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