ArrayBackedSortedColumns is not being used by ColumnFamily.cloneMeShallow()
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Key: CASSANDRA-3165
URL: https://issues.apache.org/jira/browse/CASSANDRA-3165
Project: Cassandra
Issue Type: New Feature
Reporter: Yang Yang
Priority: Minor
JIRA 2843 utilizes ArrayBackedSortedColumns for read path.
but this is missed in ColumnFamily.cloneMeShallow(), which still calls
ColumnFamily.create() without the factory, so it defaults to the slower
SkipList-based one.
an easy change is to remember the factory, and use it when cloneMeShallow()
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