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Sub-optimal query generation with Projectable property returning child entity #139

@DanielStout5

Description

@DanielStout5

Here's the class and query:

public class Order
{
  public Address? ShippingAddress { get; set; }
  public Address? BillingAddress { get; set; }
  
  [Projectable]
  public Address Address => ShippingAddress ?? BillingAddress;
}

await db.Orders.Select(x => x.Address.StreetAddress).FirstOrDefaultAsync();

That query generates SQL that selects all columns on both address entities which isn't ideal:

SELECT TOP(1) CASE
    WHEN [a].[Id] IS NULL THEN CAST(1 AS bit)
    ELSE CAST(0 AS bit)
END, [a0].[Id], [a0].[City], [a0].[CountryCode], [a0].[CountryId], [a0].[Country], [a0].[CreatedAt], [a0].[Data], [a0].[FirstName], [a0].[LastName], [a0].[PostalCode], [a0].[ProvinceCode], [a0].[ProvinceId], [a0].[ProvinceOrState], [a0].[StreetAddress], [a0].[StreetAddress2], [a0].[UpdatedAt], [a0].[UserData], [a0].[UserId], [a].[Id], [a].[City], [a].[CountryCode], [a].[CountryId], [a].[Country], [a].[CreatedAt], [a].[Data], [a].[FirstName], [a].[LastName], [a].[PostalCode], [a].[ProvinceCode], [a].[ProvinceId], [a].[ProvinceOrState], [a].[StreetAddress], [a].[StreetAddress2], [a].[UpdatedAt], [a].[UserData], [a].[UserId]
FROM [dbo].[Orders] AS [o]
LEFT JOIN [dbo].[Addresses] AS [a] ON [o].[ShippingAddressId] = [a].[Id]
LEFT JOIN [dbo].[Addresses] AS [a0] ON [o].[BillingAddressId] = [a0].[Id]

Is there a way to use Projectables like that without selecting all the additional columns?

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