Как использовать функцию DAX ParallelPeriod

Функция ParaellePeriod позволяет сравнивать значения между моментами времени (как соотносятся продажи с прошлым годом). Я что-то неправильно использую, но понятия не имею, что эта штукаможет быть.

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Я создал очень простой исходный запрос PowerPivot SQL Server 2008+ и назвал его Source. Запрос генерирует 168 строк: 6 идентификаторов (100-600) и 28 дат (первые числа месяца с января 2010 г. по апрель 2012 г.), все они применяются вместе.

; WITH SRC (groupKey, eventDate, value) AS
(
    SELECT G.groupKey, D.eventDate, CAST(rand(G.groupKey * year(D.eventDate) * month(D.eventDate)) * 100 AS int)
    FROM
    (
        SELECT 100
        UNION ALL SELECT 200
        UNION ALL SELECT 300
        UNION ALL SELECT 400
        UNION ALL SELECT 500
        UNION ALL SELECT 600
    ) G (groupKey)
    CROSS APPLY
    (
                  SELECT CAST('2010-01-01' AS date)
        UNION ALL SELECT CAST('2010-02-01' AS date)
        UNION ALL SELECT CAST('2010-03-01' AS date)
        UNION ALL SELECT CAST('2010-04-01' AS date)
        UNION ALL SELECT CAST('2010-05-01' AS date)
        UNION ALL SELECT CAST('2010-06-01' AS date)
        UNION ALL SELECT CAST('2010-07-01' AS date)
        UNION ALL SELECT CAST('2010-08-01' AS date)
        UNION ALL SELECT CAST('2010-09-01' AS date)
        UNION ALL SELECT CAST('2010-10-01' AS date)
        UNION ALL SELECT CAST('2010-11-01' AS date)
        UNION ALL SELECT CAST('2010-12-01' AS date)
        UNION ALL SELECT CAST('2011-01-01' AS date)
        UNION ALL SELECT CAST('2011-02-01' AS date)
        UNION ALL SELECT CAST('2011-03-01' AS date)
        UNION ALL SELECT CAST('2011-04-01' AS date)
        UNION ALL SELECT CAST('2011-05-01' AS date)
        UNION ALL SELECT CAST('2011-06-01' AS date)
        UNION ALL SELECT CAST('2011-07-01' AS date)
        UNION ALL SELECT CAST('2011-08-01' AS date)
        UNION ALL SELECT CAST('2011-09-01' AS date)
        UNION ALL SELECT CAST('2011-10-01' AS date)
        UNION ALL SELECT CAST('2011-11-01' AS date)
        UNION ALL SELECT CAST('2011-12-01' AS date)
        UNION ALL SELECT CAST('2012-01-01' AS date)
        UNION ALL SELECT CAST('2012-02-01' AS date)
        UNION ALL SELECT CAST('2012-03-01' AS date)
        UNION ALL SELECT CAST('2012-04-01' AS date)
    ) D (eventDate)
)
SELECT
    *
FROM
    SRC;

Я добавил производный столбец в PowerPivot, используя формулу, взятую из MSDN.

=CALCULATE(SUM(Source[value]), PARALLELPERIOD(Source[eventDate], -1, year))

Ошибки не отображаются, но никогда не отображаются расчетные данные. Я пробовал разные интервалы (-1, +1) и периоды (год, месяц), но безрезультатно.

Единственное, что, как я заметил, отличалось между моей демонстрацией и MSDN, заключалось в том, что у них было отдельное измерение, определенное для даты. Достаточно легко исправить, поэтому я создал запрос Dates со следующим. Этот запрос генерирует строку для всех дней между 01.01.2010 и 01.06.2012 (1096 строк)

DECLARE
    @start int = 20100101
,   @stop int = 20120601;

WITH L0 AS
(
    SELECT
        0 AS C
    UNION ALL
    SELECT
        0
)
, L1 AS
(
    SELECT
        0 AS c
    FROM
        L0 AS A
        CROSS JOIN L0 AS B
)
, L2 AS
(
    SELECT
        0 AS c
    FROM
        L1 AS A
        CROSS JOIN L1 AS B
)
, L3 AS
(
    SELECT
        0 AS c
    FROM
        L2 AS A
        CROSS JOIN L2 AS B
)
, L4 AS
(
    SELECT
        0 AS c
    FROM
        L3 AS A
        CROSS JOIN L3 AS B
)
, L5 AS
(
    SELECT
        0 AS c
    FROM
        L4 AS A
        CROSS JOIN L4 AS B
)
, NUMS AS
(
    SELECT
        ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) AS number
    FROM
        L5
)
,   YEARS AS
(
    SELECT 
        Y.number 
    FROM
        NUMS Y
    WHERE
        Y.number BETWEEN @start / 10000 AND @stop / 10000
)
,   MONTHS AS
(
    SELECT 
        Y.number 
    FROM
        NUMS Y
    WHERE
        Y.number BETWEEN 1 and 12
)
,   DAYS AS
(
    SELECT 
        Y.number 
    FROM
        NUMS Y
    WHERE
        Y.number BETWEEN 1 and 31
)
,  CANDIDATES_0 AS
(
    SELECT
        Y.number * 10000 + M.number * 100 + D.number AS SurrogateKey 
    ,   CAST(Y.number * 10000 + M.number * 100 + D.number AS char(8)) AS DateValue
    FROM 
        YEARS Y
        CROSS APPLY
            MONTHS M
        CROSS APPLY
            DAYS D
)
, HC AS
(
    SELECT
        Y.number * 10000 + M.number * 100 + D.number AS SurrogateKey 
    ,   CAST(Y.number * 10000 + M.number * 100 + D.number AS char(8)) AS DateValue
    FROM 
        YEARS Y
        CROSS APPLY
            MONTHS M
        CROSS APPLY
            DAYS D
    WHERE
        D.number < 31
        AND M.number IN (4,6,9,11)

    UNION ALL
    SELECT
        Y.number * 10000 + M.number * 100 + D.number AS SurrogateKey 
    ,   CAST(Y.number * 10000 + M.number * 100 + D.number AS char(8)) AS DateValue
    FROM 
        YEARS Y
        CROSS APPLY
            MONTHS M
        CROSS APPLY
            DAYS D
    WHERE
        D.number < 32
        AND M.number IN (1,3,5,7,8,10,12)

    UNION ALL
    SELECT
        Y.number * 10000 + M.number * 100 + D.number AS SurrogateKey 
    ,   CAST(Y.number * 10000 + M.number * 100 + D.number AS char(8)) AS DateValue
    FROM 
        YEARS Y
        CROSS APPLY
            MONTHS M
        CROSS APPLY
            DAYS D
    WHERE
        D.number < 29
        AND M.number = 2
        AND
        ( 
            Y.number % 4 > 0
            OR Y.number % 100 = 0 AND Y.number % 400 > 0 
        )

    UNION ALL
    SELECT
        Y.number * 10000 + M.number * 100 + D.number AS SurrogateKey 
    ,   CAST(Y.number * 10000 + M.number * 100 + D.number AS char(8)) AS DateValue
    FROM 
        YEARS Y
        CROSS APPLY
            MONTHS M
        CROSS APPLY
            DAYS D
    WHERE
        D.number < 30
        AND M.number = 2
        AND
        ( 
            Y.number % 4 = 0
            OR Y.number % 100 = 0 AND Y.number % 400 = 0 
        )
)
, CANDIDATES AS
(
    SELECT
        C.SurrogateKey
    ,   CAST(C.DateValue as date) As DateValue
    FROM
        HC C
    WHERE
        ISDATE(c.DateValue) = 1
)
, PARTS 
(
    DateKey
,   FullDateAlternateKey
,   DayNumberOfWeek
,   EnglishDayNameOfWeek
,   DayNumberOfMonth
,   DayNumberOfYear
,   WeekNumberOfYear
,   EnglishMonthName
,   MonthNumberOfYear
,   CalendarQuarter 
,   CalendarYear    
,   CalendarSemester    
--,FiscalQuarter    
--,FiscalYear   
--,FiscalSemester
) AS
(
    SELECT
        CAST(C.SurrogateKey AS int)
    ,   C.DateValue
    ,   DATEPART(WEEKDAY, C.DateValue)
    ,   DATENAME(WEEKDAY, C.DateValue)
    ,   DATEPART(DAY, C.DateValue)
    ,   DATEPART(DAYOFYEAR, C.DateValue)
    ,   DATEPART(WEEK, C.DateValue)
    ,   DATENAME(MONTH, C.DateValue)
    ,   DATEPART(MONTH, C.DateValue)
    ,   DATEPART(QUARTER, C.DateValue)
    ,   DATEPART(YEAR, C.DateValue)
    ,   DATEPART(WEEK, C.DateValue)
    FROM
        CANDIDATES C
    WHERE
        C.DateValue IS NOT NULL
)
SELECT 
    P.*
FROM 
    --HC P
    PARTS P
ORDER BY 1;

С сгенерированными данными я создал связь между источником и датами и безуспешно попробовал эту формулу

=CALCULATE(SUM(Source[value]), PARALLELPERIOD(Dates[FullDateAlternateKey], -1, year))

Конструктор PowerPivot выглядит так:

Есть мысли, что я делаю неправильно?

Ссылки

• Функция PARALLELPERIOD
• PowerPivot DAX PARALLELPERIOD vs DATEADD