Avoid creating a new ColumnFamily object per IColumnIterator
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Key: CASSANDRA-2423
URL: https://issues.apache.org/jira/browse/CASSANDRA-2423
Project: Cassandra
Issue Type: Improvement
Reporter: Stu Hood
IColumnIterators that read data from sstables create a new ColumnFamily object
as a metadata-and-serializer-holder. Although we should also focus on making
the CF object lighter, it might be a nice win to eliminate this object creation.
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