如果linq加入可以为空的字段

Question

C＃（model + linq）：

public class RepairRecord 
{
    public Guid? CheckId {get;set;}
    //more properties
}
public class ProductTracking
{
    public Guid? CheckId {get;set;}
    //more properties
}

var query = from a in context.Set<RepairRecord>()
                        join b in context.Set<ProductTracking>() on a.CheckId.Value equals b.CheckId.Value
                        select 1;

var queryResult = query.FirstOrDefault();

SQL：

SELECT 
    [Limit1].[C1] AS [C1]
    FROM ( SELECT TOP (1) 
        1 AS [C1]
        FROM  [dbo].[MES_REPAIR_RECORD] AS [Extent1]
        INNER JOIN [dbo].[MES_PRODUCT_TRACKING] AS [Extent2] ON ([Extent1].[CHECK_ID] = [Extent2].[CHECK_ID]) OR (([Extent1].[CHECK_ID] IS NULL) AND ([Extent2].[CHECK_ID] IS NULL))
    )  AS [Limit1]

我不需要空值匹配，如何修改我的C＃以使sql看起来像这样：

SELECT 
    [Limit1].[C1] AS [C1]
    FROM ( SELECT TOP (1) 
        1 AS [C1]
        FROM  [dbo].[MES_REPAIR_RECORD] AS [Extent1]
        INNER JOIN [dbo].[MES_PRODUCT_TRACKING] AS [Extent2] ON ([Extent1].[CHECK_ID] = [Extent2].[CHECK_ID])
    )  AS [Limit1]

我的场景中模型的定义无法修改