The document discusses improving MDX usability in Mondrian through user defined functions (UDFs). It provides examples of UDFs that allow accessing member properties, parsing dates, performing date calculations, calculating cumulative totals over time periods, aggregating calculated members, and setting default context. The UDFs extend MDX capabilities and make queries more readable and maintainable.

1. Improve Mondrian
MDX usability with
user defined functions
Raimonds Simanovskis
@rsim

2. http://github.com/rsim/mondrian-olap
https://eazybi.com

3. We create a lot of
calculated members….

4. Mondrian 3.x

5. Properties
[Issue].CurrentMember.Properties('Created at')
#ERR: mondrian.olap.fun.MondrianEvaluationException:
Property 'Created at' is not valid for member
'[Issue].[ABC]'

6. Properties
CASE WHEN [Issue].CurrentMember.Level.Name = 'Issue'
THEN
[Issue].CurrentMember.Properties('Created at')
END

7. Get properties
[Issue].CurrentMember.get('Created at')
UDF
[Issue].CurrentMember.getDate('Created at')
[Issue].CurrentMember.getBoolean('Resolved')
[Issue].CurrentMember.getNumber('Story Points')
[Issue].CurrentMember.getString('Summary')

8. Debug all properties
[Issue].CurrentMember.AllProperties
KEY: JSD-1
Created at: 2013-10-03 01:01:35
Updated at: 2015-07-23 10:40:12
Resolved at: 2013-10-03 01:10:39
Due date:
Parent issue key:
Sub-task keys:
Open sub-task keys:
Story Points:
Closed at:
Sprint: (no sprint)
Epic Link:
Reporter name: dcurrie@atlassian.com
Assignee name: jpendleton
...
UDF

9. Current hierarchy
[Time].CurrentMember
[Time.Weekly].CurrentMember
CASE
WHEN NOT [Time].CurrentMember IS [Time].DefaultMember
THEN ...
WHEN NOT [Time.Weekly].CurrentMember IS [Time.Weekly].DefaultMember
THEN ...
END

10. Current hierarchy
[Time].CurrentHierarchy
[Time].CurrentMember or [Time.Weekly].CurrentMember
[Time].CurrentHierarchyMember
[Time] or [Time.Weekly]
UDF

11. Current hierarchy
member properties
[Issue].CurrentHierarchyMember.get('Created at')
UDF

12. Current Time period
CurrentDateMember([Time],
'["Time"].[yyyy].["Q"q].[m].[d]')
[Time].[Day].CurrentDateMember UDF

13. Date parsing
DateParse('2016-11-12')
DateParse('Nov 12 2016')
DateParse('today')
DateParse('3 months ago')
DateParse('10 days from now')
UDF

14. Time period start and
end dates
[Time].CurrentHierarchyMember.StartDate
[Time].CurrentHierarchyMember.NextStartDate
UDF

15. Date calculations
DateCompare
DateAddDays
DateDiffDays
DateDiffHours
DateDiffMinutes
DateBetween
DateDiffWorkdays
DateAddWorkdays
DateInPeriod
DateAfterPeriodEnd
DateBeforePeriodEnd
AnyDateInPeriod
[Time].[Month].DateMember('3 months ago')
UDF

16. Cumulative totals
Sum(
[Time].CurrentHierarchyMember.Level.Members.Item(0):
[Time].CurrentHierarchyMember,
expression
)
Sum(
PeriodsToDate([Time].[(All)],
[Time].CurrentHierarchyMember),
expression
)

17. Cumulative totals
Sum(
{ Generate(
Ascendants([Time].CurrentHierarchyMember),
IIF([Time].CurrentHierarchyMember IS
[Time].CurrentHierarchyMember.FirstSibling, {},
{ [Time].CurrentHierarchyMember.FirstSibling:
[Time].CurrentHierarchyMember.PrevMember } ) ),
[Time].CurrentHierarchyMember
},
expression
)

18. Cumulative totals
Sum(
{ PreviousPeriods([Time].CurrentHierarchyMember),
[Time].CurrentHierarchyMember },
expression
)
UDF

19. Aggregated
calculated members
[Project].[A and B] =
Aggregate({[Project].[A], [Project].[B]})
UDF
ChildrenSet([Project].[A and B]) =
{[Project].[A], [Project].[B]}

20. Default context
DefaultContext( (measure, member_2) ) =
(measure, member_2,
default_member_3, ..., default_member_N)
UDF
DefaultContext(
( [Measures].[Store Sales],
[Customers].CurrentMember )
)

21. https://docs.eazybi.com/display/EAZYBI/
MDX+Function+Reference
https://github.com/rsim/mondrian_udf