Michael Semb Wever created CASSANDRA-20927:
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             Summary: Fix ShardManager#coveringRange to include provide 
partition position
                 Key: CASSANDRA-20927
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-20927
             Project: Apache Cassandra
          Issue Type: Bug
          Components: Local/Compaction
            Reporter: Michael Semb Wever


Range is left exclusive. When constructing Range, it should decrement left 
position instead of incrementing right position.

Also ShardManager#rangeSpanned for (min, min] should be 1 instead of 1 token 
span.

Impact is trivial: it can cause is a range to be measured to span 0 range 
instead of 2^-64 (if it only contains one partition that falls on a local 
ownership boundary), but this is then anyway corrected to give it a sensible 
density. 

The min-min case only relates to tests.



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