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https://issues.apache.org/jira/browse/CASSANDRA-325?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12737169#action_12737169
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Jonathan Ellis commented on CASSANDRA-325:
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Oh, right, I forgot about the sparse aspect.

I'm having trouble coming up with a workload that involves frequently asking 
for columns that don't exist, though.

> Column bloomfilter not exploited
> --------------------------------
>
>                 Key: CASSANDRA-325
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-325
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Jun Rao
>
> There is a bloomfilter created for all columns per row in SSTables. The 
> bloomfilter is deserialized during read, but is not checked.

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