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Posted to issues@kylin.apache.org by "Alexander Sterligov (JIRA)" <ji...@apache.org> on 2017/08/08 09:28:00 UTC

[jira] [Created] (KYLIN-2779) Segment size estimation is wrong for bitmap measure

Alexander Sterligov created KYLIN-2779:
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             Summary: Segment size estimation is wrong for bitmap measure
                 Key: KYLIN-2779
                 URL: https://issues.apache.org/jira/browse/KYLIN-2779
             Project: Kylin
          Issue Type: Bug
    Affects Versions: v2.0.0
            Reporter: Alexander Sterligov


If bitmap is used for distinct count, then size estimation is wrong for about 4 times.

The problem is fixed by kylin.cube.size-estimate-countdistinct-ratio=0.2.



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