Benedict created CASSANDRA-14845:
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             Summary: SSTable Columns accumulate forever
                 Key: CASSANDRA-14845
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14845
             Project: Cassandra
          Issue Type: Bug
            Reporter: Benedict


When merging multiple sstables together, we assume the union of all columns 
will be present in the output.  This will slowly pollute storage efficiency 
after each dropped column from the schema, as it becomes impossible for rows to 
store the whole set of columns (and may necessitate larger bit sets over time)



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