time-based slicing does not work correctly w/ "historial" memtables
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                 Key: CASSANDRA-223
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-223
             Project: Cassandra
          Issue Type: Bug
            Reporter: Jonathan Ellis


TimeFilter assumes that it is done as soon as it finds a column stamped earlier 
than what it is filtering on, but when you have a group of "historical" 
memtables whose columns were written in an arbitrary order this is not a safe 
assumption.

It is not even a safe assumption when dealing with a single memtable + sstable 
pair, as the attached new test shows.

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