[Mondrian] DRILLTHROUGH behavior change in lagunitas

Ati Rosselet ati.rosselet at gmail.com
Wed Mar 6 02:52:24 EST 2013

Hi Julian!
One note on the new behaviour.   With the old system, I had implemented an
"additionalColumns setting to the base fact table definition that allowed
me to specify additional columns (with i18n column name aliases) to be
added to the drillthrough request.  This was in order to display those
column values that contain pertinent business data (comments, booking codes
etc) that although important, were not relevant to the actual cube data
displayed (e.g. only of use when needing to understand the source of a
specific data row), and are often really not aggregation friendly (i.e.
almost unique strings etc).   Is there a similar function provided, or
could there be one for this new method?  We find that customers use this
feature quite frequently (especially controllers like to see the "row" that
the data comes from).

On Wed, Mar 6, 2013 at 12:55 AM, Julian Hyde <jhyde at pentaho.com> wrote:

> Luc changed the behavior of DRILLTHROUGH on lagunitas branch in August
> (see
> https://github.com/pentaho/mondrian/commit/cb9854af5a654641bc6f524ed9f452a283f04459),
> and I'm only now reviewing the change. The effect is that DRILLTHROUGH now
> returns the cells at the "bottom of the cube" (i.e. at the lowest level of
> every hierarchy in the cube) as opposed to the rows in the fact table.
> Before we release this change in mondrian-4, I want to check two things:
> 1. Is the new behavior consistent with the spec?
> 2. Which behavior do our users want, the old or the new?
> Luc is half right when he says in his check-in comment that the new
> behavior is "per SSAS specs". The latest specs (
> http://technet.microsoft.com/en-us/library/ms145964.aspx) say
> > By default, a drillthrough result set is derived from the table rows
> that were evaluated
> > to calculate the value of the selected Analysis Services, the results
> are retrieved
> > directly from MOLAP storage, unless ROLAP partitions or dimensions are
> queried.
> In other words, an engine should return the lowest level cell data that it
> has. If SSAS is running in ROLAP mode, it will return table rows.  Since
> Mondrian is a ROLAP engine, it should return table rows too. They basically
> cut SSAS some slack when it is running in MOLAP mode.
> Now, the more important question: What do our users want? Users, please
> chime in. If I hear nothing, we will probably keep the new behavior.
> Julian
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