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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