按优化排名筛选FREETEXTTABLE输出

Question

我尝试优化以下查询，该查询返回与搜索词组匹配的产品：

WITH [RankedQuery] AS
(
    SELECT FTS.RANK, ROW_NUMBER() OVER (ORDER BY [FTS].RANK DESC) AS [RowNumber], [Product].*
    FROM [Product]
    INNER JOIN FREETEXTTABLE([Product], 
    (
        [Name],
        [Brand],
        [Category],
        [Description]
    ), 'man shoes') AS [FTS]
    ON FTS.[Key] = [Product].[Id]
)
SELECT * FROM [RankedQuery]
WHERE [RowNumber] BETWEEN 100 AND 150

我在执行计划中发现它花费大部分时间按RANK对结果进行排序 - 这是有道理的，因为它必须通过许多非必要的行。

我尝试通过在排序前按排名过滤产品来优化它，但结果很差。

查询：

WITH [RankedQuery] AS
(
    SELECT MaxRelevance, FTS.RANK, ROW_NUMBER() OVER (ORDER BY [FTS].RANK DESC) AS [RowNumber], [Product].*
    FROM [Product]
    INNER JOIN 
    (
        select * from
        (   
            select FTS_stage_1.*, max(FTS_stage_1.rank) over() as MaxRelevance 
            from FREETEXTTABLE
            ([Product], 
                (
                    [Name],
                    [Brand],
                    [Category],
                    [Description]
                ), 'man shoes'
            ) 
            as FTS_stage_1
        ) AS [FTS_with_MaxRelevance]
        where [FTS_with_MaxRelevance].Rank > [FTS_with_MaxRelevance].MaxRelevance * 0.3 
    ) AS [FTS]
    ON FTS.[Key] = [Product].[Id]
)
SELECT * FROM [RankedQuery]
WHERE [RowNumber] BETWEEN 100 AND 150

造成了这种怪异，并且执行时间延长了几倍。

有没有办法让它更有效率？