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Posted to dev@metamodel.apache.org by "Kasper Sørensen (JIRA)" <ji...@apache.org> on 2015/10/23 16:23:27 UTC

[jira] [Created] (METAMODEL-201) Optimize "approximate count" functions on various SQL dialects

Kasper Sørensen created METAMODEL-201:
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             Summary: Optimize "approximate count" functions on various SQL dialects
                 Key: METAMODEL-201
                 URL: https://issues.apache.org/jira/browse/METAMODEL-201
             Project: Apache MetaModel
          Issue Type: Improvement
            Reporter: Kasper Sørensen


Working on METAMODEL-200 I got curious and looked at various SQL dialects for selecting an "approximate count".

I found a few examples which we could include into our IQueryRewriter implementations to make approximate counting faster:

PostgreSQL: https://wiki.postgresql.org/wiki/Count_estimate

SQL server: http://www.revindex.com/Resources/Blogs/EntryID/32



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