We have a need to limit the rows axis to specific members:

xmlaDataSource.Rows = DataSourceBase.GenerateInitialItems([Date].[Calendar]{[Date].[Calendar].[Date].&[20080702]}");

Unfortunately, this causes a change in behavior within XmlaDataSource.UpdateHierarchiesCollection whereby the entire dimension hierarchy is retrieved instead of just a single level. Looking at the code it seems like the design approach in this case is to fetch the hierarchy and then apply this "pre-filter" after the dimension results are returned.

The associated performance impact is severe -- in the dimension we are working with there is still no response after 10 minutes, whereas without the member value it is a few seconds.

It would be wonderful if Infragistics can address this issue! It's a severe limitation for us and I expect others.

If that is not feasible in the near-term, I still need to resolve it for my own purpose. My approach is to add an event handler for InitXmlaMethod and modify the MDSCHEMA_MEMBERS RequestType to add a MEMBER_UNIQUE_NAME restriction for the member value:

    void xmlaDataSource_InitXmlaMethod(object sender, InitXmlaMethodEventArgs e)
    {
        var discoverMethod = e.SoapMethod as XmlaSoapMethodDiscover;
        if (discoverMethod != null)
        {
            if (discoverMethod.RequestType == "MDSCHEMA_MEMBERS")
            {
                    discoverMethod.Restrictions.Add("MEMBER_UNIQUE_NAME", "[Date].[Calendar].[Date].&[20080702]");
            }
        }
    }

Looking at the request and response in Fiddler, I see that this works well.

However, this change causes the following Execute request to generate a malformed statement.

Below is what the statement looks like without adding the restriction. Bolded is what is omitted from the statement when the restriction is added.

SELECT

NON EMPTY

{{[Date].[Calendar].[All Periods]},

{[Date].[Calendar].[All Periods].Children},

{[Date].[Calendar].[Calendar Year].&[2008].Children},

{[Date].[Calendar].[Calendar Semester].&[2008]&[2].Children},

{[Date].[Calendar].[Calendar Quarter].&[2008]&[3].Children},

{[Date].[Calendar].[Month].&[2008]&[7].Children}}

DIMENSION PROPERTIES

CHILDREN_CARDINALITY

,PARENT_UNIQUE_NAME

ON COLUMNS

FROM

(

SELECT

[Date].[Calendar].[Date].&[20080701] ON COLUMNS

FROM [Adventure Works]

)

WHERE ([Measures].[Internet Sales Amount])

I appreciate your assistance with working through this difficulty.

Thanks,

Gary