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https://issues.apache.org/jira/browse/CASSANDRA-5912?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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C. Scott Andreas updated CASSANDRA-5912:
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Component/s: CQL
> Optimize listing partition keys
> -------------------------------
>
> Key: CASSANDRA-5912
> URL: https://issues.apache.org/jira/browse/CASSANDRA-5912
> Project: Cassandra
> Issue Type: Improvement
> Components: CQL
> Reporter: Sylvain Lebresne
> Assignee: Suresh
> Priority: Minor
>
> That's a small followup to optimize the DISTINCT support added by
> CASSANDRA-4536 if we feel like it's worth it.
> Quoting the initial ticket: it should be possible to optimize that further if
> we consider it worth it by adding a 1 bit per key info in the sstable index
> saying 'is there at least one live column for that key in that sstable' (we
> could even add that bit-per-key without augmenting the on-disk index size if
> we want to by using the first bit of the key position (since we use it as a
> signed long and thus the first bit is unused)).
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