Dayue Gao created KYLIN-2386:
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Summary: Revert KYLIN-2349 and KYLIN-2353
Key: KYLIN-2386
URL: https://issues.apache.org/jira/browse/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|https://github.com/RoaringBitmap/RoaringFormatSpec/]. 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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