Предикат Include и Where вызывает левое соединение вместо внутреннего соединения

При следующей структуре таблицы (удалены лишние столбцы)

create table [Events]
(
    ID int not null identity,
    Name nvarchar(128) not null,
    constraint PK_Events primary key(ID)
)

create table [Donations]
(
    ID int not null identity,
    EventID int not null,
    Amount decimal(10, 2) not null,

    constraint PK_Donations primary key(ID),
    constraint FK_Donations_Events foreign key(EventID) references [Events](ID) on update no action on delete no action
)

Я использую следующие запросы Linq -- -Entities:

// 1
ents.Donations.Where(d => d.Amount > 25.0m && d.Event.Name.Contains("Run")).ToList();

// 2
ents.Donations.Include("Event").Where(d => d.Amount > 25.0m).ToList();

// 3
ents.Donations.Include("Event").Where(d => d.Amount > 25.0m && d.Event.Name.Contains("Run")).ToList();

Производит (из SQL Profiler):

-- 1
SELECT 
[Extent1].[ID] AS [ID], 
[Extent1].[EventID] AS [EventID], 
[Extent1].[Amount] AS [Amount]
FROM  [dbo].[Donations] AS [Extent1]
INNER JOIN [dbo].[Events] AS [Extent2] ON [Extent1].[EventID] = [Extent2].[ID]
WHERE ([Extent1].[Amount] > 25.0) AND ([Extent2].[Name] LIKE N'%Run%')

-- 2
SELECT 
[Extent1].[ID] AS [ID], 
[Extent1].[EventID] AS [EventID], 
[Extent1].[Amount] AS [Amount], 
[Extent2].[ID] AS [ID1], 
[Extent2].[Name] AS [Name]
FROM  [dbo].[Donations] AS [Extent1]
INNER JOIN [dbo].[Events] AS [Extent2] ON [Extent1].[EventID] = [Extent2].[ID]
WHERE [Extent1].[Amount] > 25.0

-- 3
SELECT 
[Extent1].[ID] AS [ID], 
[Extent1].[EventID] AS [EventID], 
[Extent1].[Amount] AS [Amount], 
[Extent3].[ID] AS [ID1], 
[Extent3].[Name] AS [Name]
FROM   [dbo].[Donations] AS [Extent1]
INNER JOIN [dbo].[Events] AS [Extent2] ON [Extent1].[EventID] = [Extent2].[ID]
LEFT OUTER JOIN [dbo].[Events] AS [Extent3] ON [Extent1].[EventID] = [Extent3].[ID]
WHERE ([Extent1].[Amount] > 25.0) AND ([Extent2].[Name] LIKE N'%Run%')

Почему в третьем запросе он генерирует LEFT OUTER JOINв таблице Eventsво второй раз? Хотя запрос дает правильные результаты, это кажется странным, почему EF/LINQ re -не может использовать [Extent2]в предложении SELECTи WHERE, и почему это LEFT OUTER JOIN?

Я использую Visual Studio 2010 sp1.NET 4 и подключаюсь к Sql Server 2008 Express.