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https://issues.apache.org/jira/browse/BEAM-6324?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16803004#comment-16803004
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Ismaël Mejía commented on BEAM-6324:
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[~srfrnk] BEAM-6861 introduced support to pass the full query to CassandraIO so 
now this filter feature is duplicated and after discussion with [~echauchot] we 
consider that it is probably a better idea to remove it to make the maintenance 
easier. Please excuse me for proposing this but it will be easier for the users 
of the IO too.

> CassandraIO.Read - Add the ability to provide a filter to the query
> -------------------------------------------------------------------
>
>                 Key: BEAM-6324
>                 URL: https://issues.apache.org/jira/browse/BEAM-6324
>             Project: Beam
>          Issue Type: Improvement
>          Components: io-java-cassandra
>    Affects Versions: 2.9.0
>            Reporter: Shahar Frank
>            Assignee: Shahar Frank
>            Priority: Major
>              Labels: performance, pull-request-available, triaged
>             Fix For: 2.12.0
>
>          Time Spent: 12h
>  Remaining Estimate: 0h
>
> CassandraIO.Read doesn't support using WHERE to filter the input at the 
> source (In Cassandra) which might provide great performance boost.
> Already implemented by:
> https://github.com/apache/beam/pull/7340



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