FILTER 应该用在 SUMMARIZE 的内部还是外部？

Question

我有这两个问题：

EVALUATE
FILTER (
    SUMMARIZE (
        'Sales',
        Products[ProductName],
        'Calendar'[CalendarYear],
        "Total Sales Amount", SUM ( Sales[SalesAmount] ),
        "Total Cost", SUM ( 'Sales'[TotalProductCost] )
    ),
    Products[ProductName] = "AWC Logo Cap"
)
ORDER BY
    Products[ProductName],
    'Calendar'[CalendarYear] ASC

还有这个：

EVALUATE
SUMMARIZE (
    FILTER ( 'Sales', RELATED ( Products[ProductName] ) = "AWC Logo Cap" ),
    Products[ProductName],
    'Calendar'[CalendarYear],
    "Total Sales Amount", SUM ( Sales[SalesAmount] ),
    "Total Cost", SUM ( 'Sales'[TotalProductCost] )
)
ORDER BY
    Products[ProductName],
    'Calendar'[CalendarYear] ASC

以下两个 return：

两个查询之间的唯一区别是 FILTER 函数的定位 - 哪个更好，为什么？

注意

所以看看 Alex 引用的两篇 sqlbi 文章，我们可以执行以下任一操作来潜在地提高性能，但我仍然不确定 FILTER 函数是否应该在其他语法内部或外部发生：

EVALUATE
FILTER (
    ADDCOLUMNS (
        SUMMARIZE ( 'Sales', Products[ProductName], 'Calendar'[CalendarYear] ),
        "Total Sales Amount", CALCULATE ( SUM ( Sales[SalesAmount] ) ),
        "Total Cost", CALCULATE ( SUM ( 'Sales'[TotalProductCost] ) )
    ),
    Products[ProductName] = "AWC Logo Cap"
)
ORDER BY
    Products[ProductName],
    'Calendar'[CalendarYear] ASC

并使用'SUMMARIZECOLUMNS'函数：

EVALUATE
FILTER (
    SUMMARIZECOLUMNS (
        Products[ProductName],
        'Calendar'[CalendarYear],
        "Total Sales Amount", SUM ( Sales[SalesAmount] ),
        "Total Cost", SUM ( 'Sales'[TotalProductCost] )
    ),
    Products[ProductName] = "AWC Logo Cap"
)
ORDER BY
    Products[ProductName],
    'Calendar'[CalendarYear] ASC

注2

看起来 SUMMARIZECOLUMNS 有一个内置的 FILTER 参数，所以我猜这是防止性能问题的最佳方法：

EVALUATE
SUMMARIZECOLUMNS (
    Products[ProductName],
    'Calendar'[CalendarYear],
    FILTER ( 'Products', Products[ProductName] = "AWC Logo Cap" ),
    "Total Sales Amount", SUM ( Sales[SalesAmount] ),
    "Total Cost", SUM ( 'Sales'[TotalProductCost] )
)
ORDER BY
    Products[ProductName],
    'Calendar'[CalendarYear] ASC

Answer 1

在您提供的两个选项中，我怀疑后者的计算效率更高。但是，两者都不是“最佳实践”。

根据Best Practices Using SUMMARIZE and ADDCOLUMNS on sqlbi.com,

you should always favor the ADDCOLUMNS version. The rule of thumb is that you should never add extended columns by using SUMMARIZE, unless it is required due to at least one of the following conditions:

You want to use ROLLUP over one or more grouping columns in order to obtain subtotals

You are using non-trivial table expressions in the extended column, as you will see in the “Filter Context in SUMMARIZE and ADDCOLUMNS” section later in this article

另请查看他们关于 SUMMARIZECOLUMNS 的文章，该文章在大多数用例中推荐了较新的功能。

FILTER 应该用在 SUMMARIZE 的内部还是外部？

Should FILTER be used inside or outside of SUMMARIZE?

dax