[nhibernate-issues] [NHJIRA] Commented: (NH-2690) Linq Select() broken with .ToFuture()

[Kelly S. (JIRA) <nh...@gm...>]

    [ http://216.121.112.228/browse/NH-2690?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=21063#action_21063 ] 

Kelly Stuard commented on NH-2690:
----------------------------------

Big thanks to all who touched this. This allows for all sorts of performance improvements.

> Linq Select() broken with .ToFuture()
> -------------------------------------
>
>                 Key: NH-2690
>                 URL: http://216.121.112.228/browse/NH-2690
>             Project:  NHibernate
>          Issue Type: Bug
>          Components: Linq Provider
>    Affects Versions: 3.1.0
>            Reporter: Kelly Stuard
>            Assignee: Fabio Maulo
>            Priority: Major
>             Fix For: 3.2.0Beta1
>
>         Attachments: nh2690 nh2422 nh2421.patch, NH2690.zip
>
>
> //Given the following:
> var query =
> 	from cat in session.Query<Cat>()
> 	select new
> 	{
> 		Id = cat.Id,
> 		Name = cat.Name,
> 	};
> //This works:
> var result1 = query.ToList();
> //But this does not:
> var queryResults = query.ToFuture().ToList();
> Exception:
> NHibernate.HibernateException was unhandled
>   Message=Failed to execute multi query: [select cat0_.Id as col_0_0_, cat0_.Name as col_1_0_ from Cat cat0_;
> ]
>   Source=NHibernate
>   StackTrace:
>        at NHibernate.Impl.MultiQueryImpl.DoList()
>        at NHibernate.Impl.MultiQueryImpl.ListIgnoreQueryCache()
>        at NHibernate.Impl.MultiQueryImpl.List()
>        at NHibernate.Impl.FutureQueryBatch.GetResultsFrom(IMultiQuery multiApproach)
>        at NHibernate.Impl.FutureBatch`2.GetResults()
>        at NHibernate.Impl.FutureBatch`2.get_Results()
>        at NHibernate.Impl.FutureBatch`2.GetCurrentResult[TResult](Int32 currentIndex)
>        at NHibernate.Impl.FutureBatch`2.<>c__DisplayClass4`1.<GetEnumerator>b__3()
>        at NHibernate.Impl.DelayedEnumerator`1.<get_Enumerable>d__0.MoveNext()
>        at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
>        at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
>        at NHibernate.Test.NHSpecificTest.NH1234.SampleTest.ShouldBeAbleToFutureSelectOntoAnonymous() in C:\Users\kstuard\Desktop\NH2540\NHibernate.Test\NHSpecificTest\NH1234\SampleTest.cs:line 97
>        at ConsoleApplication2.Program.Main(String[] args) in C:\Users\kstuard\Desktop\NH2540\ConsoleApplication2\Program.cs:line 16
>        at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
>        at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
>        at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
>        at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
>        at System.Threading.ThreadHelper.ThreadStart()
>   InnerException: System.ArgumentException
>        Message=The value "System.Object[]" is not of type "<>f__AnonymousType0`2[System.Int32,System.String]" and cannot be used in this generic collection.
> Parameter name: value
>        Source=mscorlib
>        ParamName=value
>        StackTrace:
>             at System.ThrowHelper.ThrowWrongValueTypeArgumentException(Object value, Type targetType)
>             at System.Collections.Generic.List`1.System.Collections.IList.Add(Object item)
>             at NHibernate.Impl.MultiQueryImpl.DoList()
>        InnerException: 
> This works fine if I select directly to typeof(Cat). Future is such a wonderful tool; it would be great if it worked in this scenario.
> I will attach test cases used to generate this exception, shortly.

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