[nhibernate-issues] [NHJIRA] Created: (NH-2717) Count() after Cast<>() causes InvalidOperationException

[Sergey K. (JIRA) <nh...@gm...>]

Count() after Cast<>() causes InvalidOperationException
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                 Key: NH-2717
                 URL: http://216.121.112.228/browse/NH-2717
             Project:  NHibernate
          Issue Type: Bug
          Components: Linq Provider
    Affects Versions: 3.1.0
            Reporter: Sergey Karpushev
            Priority: Major
         Attachments: CastCount.patch

patch for with a test and fix attached

Test 'NHibernate.Test.Linq.ByMethod.CastTests.CastCount' failed: System.InvalidOperationException : No coercion operator is defined between types 'System.Int32' and 'NHibernate.DomainModel.Northwind.Entities.Animal'.
	at System.Linq.Expressions.Expression.GetUserDefinedCoercionOrThrow(ExpressionType coercionType, Expression expression, Type convertToType)
	at System.Linq.Expressions.Expression.Convert(Expression expression, Type type)
	at Remotion.Data.Linq.Clauses.ResultOperators.CastResultOperator.GetNewItemExpression(Expression inputItemExpression)
	at Remotion.Data.Linq.Clauses.ResultOperators.CastResultOperator.GetOutputDataInfo(IStreamedDataInfo inputInfo)
	Linq\Visitors\QueryModelVisitor.cs(133,0): at NHibernate.Linq.Visitors.QueryModelVisitor.VisitResultOperator(ResultOperatorBase resultOperator, QueryModel queryModel, Int32 index)
	at Remotion.Data.Linq.Clauses.ResultOperatorBase.Accept(IQueryModelVisitor visitor, QueryModel queryModel, Int32 index)
	at Remotion.Data.Linq.QueryModelVisitorBase.VisitResultOperators(ObservableCollection`1 resultOperators, QueryModel queryModel)
	at Remotion.Data.Linq.QueryModelVisitorBase.VisitQueryModel(QueryModel queryModel)
	Linq\Visitors\QueryModelVisitor.cs(108,0): at NHibernate.Linq.Visitors.QueryModelVisitor.Visit()
	Linq\Visitors\QueryModelVisitor.cs(59,0): at NHibernate.Linq.Visitors.QueryModelVisitor.GenerateHqlQuery(QueryModel queryModel, VisitorParameters parameters, Boolean root)
	Linq\NhLinqExpression.cs(67,0): at NHibernate.Linq.NhLinqExpression.Translate(ISessionFactoryImplementor sessionFactory)
	Hql\Ast\ANTLR\ASTQueryTranslatorFactory.cs(27,0): at NHibernate.Hql.Ast.ANTLR.ASTQueryTranslatorFactory.CreateQueryTranslators(String queryIdentifier, IQueryExpression queryExpression, String collectionRole, Boolean shallow, IDictionary`2 filters, ISessionFactoryImplementor factory)
	Engine\Query\HQLExpressionQueryPlan.cs(34,0): at NHibernate.Engine.Query.HQLExpressionQueryPlan.CreateTranslators(String expressionStr, IQueryExpression queryExpression, String collectionRole, Boolean shallow, IDictionary`2 enabledFilters, ISessionFactoryImplementor factory)
	Engine\Query\HQLExpressionQueryPlan.cs(23,0): at NHibernate.Engine.Query.HQLExpressionQueryPlan..ctor(String expressionStr, IQueryExpression queryExpression, String collectionRole, Boolean shallow, IDictionary`2 enabledFilters, ISessionFactoryImplementor factory)
	Engine\Query\HQLExpressionQueryPlan.cs(17,0): at NHibernate.Engine.Query.HQLExpressionQueryPlan..ctor(String expressionStr, IQueryExpression queryExpression, Boolean shallow, IDictionary`2 enabledFilters, ISessionFactoryImplementor factory)
	Engine\Query\QueryPlanCache.cs(88,0): at NHibernate.Engine.Query.QueryPlanCache.GetHQLQueryPlan(IQueryExpression queryExpression, Boolean shallow, IDictionary`2 enabledFilters)
	Impl\AbstractSessionImpl.cs(312,0): at NHibernate.Impl.AbstractSessionImpl.GetHQLQueryPlan(IQueryExpression queryExpression, Boolean shallow)
	Impl\AbstractSessionImpl.cs(268,0): at NHibernate.Impl.AbstractSessionImpl.CreateQuery(IQueryExpression queryExpression)
	Linq\NhQueryProvider.cs(43,0): at NHibernate.Linq.NhQueryProvider.PrepareQuery(Expression expression, IQuery& query, NhLinqExpression& nhQuery)
	Linq\NhQueryProvider.cs(26,0): at NHibernate.Linq.NhQueryProvider.Execute(Expression expression)
	Linq\NhQueryProvider.cs(103,0): at NHibernate.Linq.NhQueryProvider.Execute[TResult](Expression expression)
	at System.Linq.Queryable.Count[TSource](IQueryable`1 source)
	Linq\ByMethod\CastTests.cs(36,0): at NHibernate.Test.Linq.ByMethod.CastTests.CastCount()

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