Sylvain Lebresne created CASSANDRA-5912:
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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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