[Mondrian] Adding Grouping Set support for Distinct Count measures

Julian Hyde jhyde at pentaho.org
Tue Jan 22 19:52:30 EST 2008

No objections in principle. Have you hand-generated such queries to see
whether they are any improvement? It is possible that the queries do not
yield any performance improvement, because distinct-count is difficult for a
database to evaluate and therefore it might be difficult for the DBMS to
find commonality between the different grouping sets.
Would this work with distinct-count measures applied to aggregate members?
(For example unit sales over [CA plus OR].)


From: mondrian-bounces at pentaho.org [mailto:mondrian-bounces at pentaho.org] On
Behalf Of Ajit Vasudeo Joglekar
Sent: Tuesday, January 22, 2008 9:33 AM
To: mondrian at pentaho.org
Subject: [Mondrian] Adding Grouping Set support for Distinct Count measures

We would like to introduce grouping sets support for distinct count measures
in mondrian. We have analyzed this and it is a small change. Most of the
work is around changing and adding test cases. 

It will be great if we can make this a part of the upcoming release.
Requesting comments 



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