[Mondrian] [Fwd: Eigenbase perforce change 8900 for review]

Richard Emberson remberson at edgedynamics.com
Wed Mar 21 08:47:19 EDT 2007

Our main application developer created a calculated
measure that, basically, returned null if the
query was executed at the 'ALL' Customers level
but returned a value based upon the dataset for
Customer levels not at the 'ALL' level.
Well, this, of course, completely flies in the
face of the basic assumption of the original
crossjoin optimizer where, if there is no data
at the 'ALL' level, then there is no data below
that level and therefore no reason to include the
cell in the crossjoin.
With the checked in of the 'less optimistic' optimizer
this aberrant case, as an example, is also handled correctly.


John V. Sichi wrote:
> "The CrossJoin change was to make the optimizer less optimistic"
> Sounds like we will end up with what Julian calls a pessimiser :)
> -------- Original Message --------
> Subject: Eigenbase perforce change 8900 for review
> Date: Tue, 20 Mar 2007 15:30:01 -0800 (PST)
> From: Richard Emberson <remberson at edgedynamics.com>
> To: Andreas Voss <tonbeller at a-voss.de>, Bart Pappyn 
> <bppn at users.sourceforge.net>, Julian Hyde <jhyde at users.sourceforge.net>, 
> John V. Sichi <jsichi at gmail.com>, Matt Campbell 
> <Matthew.Campbell at thomson.com>, Sam Birney <sbirney at jaspersoft.com>
> http://p4web.eigenbase.org/@md=d&c=6PU@//8900?ac=10
> Change 8900 by emberson at bortei.head on 2007/03/20 15:28:08
>        Revised RolapResult evaluation algorithm and the CrossJoin non-empty
>        optimization algorithm.
>        The CrossJoin change was to make the optimizer less optimistic so 
> that
>        it would include values that occur in corner cases. It also
>        cached information between invocations.
>        Added ability for Calc's to cache evaluation data in the Query 
> object.
>        Made the ResultLimit check also work when an Iterable, rather than a
>        List, is used to generate the RolapAxis object.
>        Enable test RolapResultTest.java testD2
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