Dayue Gao created KYLIN-2386:

             Summary: Revert KYLIN-2349 and KYLIN-2353
                 Key: KYLIN-2386
             Project: Kylin
          Issue Type: Task
          Components: Metadata
    Affects Versions: v2.0.0
            Reporter: Dayue Gao
            Assignee: Dayue Gao

In KYLIN-2349 and KYLIN-2353, we optimized performance of BitmapCounter by 
changing its storage format. Cardinality and serialized size are recorded in 
the header of the new format, enables us to retrieve those information without 
deserialize the data.

In fact, cardinality and serialized size can be quickly calculated just from 
the header of [roaring 
format|]. Performance tests 
show that we could achieve the same performance boost without the format change 
of BitmapCounter. The benefits are
* no need to rebuild existing cube to get better performance
* no need to maintain two formats and deal with compatibility issues

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