[Mondrian] LastNonEmpty and slicers problem

Matt Campbell mcampbell at pentaho.com
Tue Oct 14 08:28:41 EDT 2014


Hi Hilario,
There’s a known issue with named set evaluation in the context of a compound slicer (MONDRIAN-1654).  Can you try moving the [date] set directly onto the row axis to see whether you get expected numbers?  And if that is your issue, vote and/or comment on the case.  I’d love to see it get addressed.

Matt


From: mondrian-bounces at pentaho.org [mailto:mondrian-bounces at pentaho.org] On Behalf Of Hilario Fernandes
Sent: Monday, October 13, 2014 12:43 PM
To: Mondrian mailing list
Subject: [Mondrian] LastNonEmpty and slicers problem

Hi,

I'm experiencing a weird behaviour while using the LastNonEmpty function. My MDX is as follows:

WITH
SET [date] AS
{LastNonEmpty([date.YEAR].[YEAR].Members, [Measures].[measure_SUM])}

SELECT
NON EMPTY {[Measures].[measure_SUM]} ON COLUMNS,
NON EMPTY {[date]} ON ROWS

FROM [cube]
WHERE {[product].[product].[a], [product].[product].[c]}

The schema:

<Cube name='cube' visible='true' cache='true' enabled='true'>
  <Table name='CUBE_609d989076e048e2a9ee831bdeaee2b3_FACT' alias='FACT_252ad422f6ae474fb25001f7586bdbd2' />
   <Dimension name='product' caption='product' visible='true'>
    <Hierarchy name='product' caption='product' allMemberName='Total product' visible='true' hasAll='true'>
      <Level name='product' caption='product' visible='true' column='ATTR_c7a295ae3dfa4af9acaacc56fc16c276' uniqueMembers='true' levelType='Regular' hideMemberIf='Never' type='String' />
    </Hierarchy>
  </Dimension>
  <DimensionUsage name='date' source='Shared Date' caption='date' visible='true' foreignKey='DIM_ID_b6c96b55efdd430b8b991d20f6eef622' />
  <Measure caption='measure_SUM' name='measure_SUM' column='MEASURE_bfe8f487ff6846b58195028020207647' formatString='Standard' aggregator='sum' />
</Cube>

and the data:

product, date, measure
a,2014-01-01, 10
b,2014-01-01, 20
c,-,null

The problem is i'd expect the above query to return the sum of the measure for the year 2014, considering the slicers, but it doesn't. Seems like the slicers aren't being properly applyed, and only the last of the set is considered during LastNonEmpty evaluation. In this case it returns nothing, because the measure is null for [product].[product].[c].

Is this a known problem or am i doing something wrong? I've been debugging mondrian code trying to understand what's going on hoping to narrow the problem and it seems to be related to LastNonEmpty.

I appreciate any help! Thank you!


--
Hilario Fernandes
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