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From "Sylvain Lebresne (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-5912) Optimize listing partition keys
Date Wed, 21 Aug 2013 15:20:51 GMT
Sylvain Lebresne created CASSANDRA-5912:
-------------------------------------------

             Summary: Optimize listing partition keys
                 Key: CASSANDRA-5912
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5912
             Project: Cassandra
          Issue Type: Improvement
            Reporter: Sylvain Lebresne
            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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