Exception with in-list where clause across joined table

[jparish9]

Windows 10, VS 2015, IIS Express, SQL Server Express 2014, EF 7.0.0-beta8, ASP.NET 6.0.0-beta8

I am seeing a "Query source has already been associated with an expression" exception when trying to run an in-list where clause across a joined table.

Models:

public class Blog
{
        public int BlogId { get; set; }

        public string Status { get; set; }
}

public class Post
{
        public int PostId { get; set; }

        public int BlogId { get; set; }

        public string PostText { get; set; }

        public Blog Blog { get; set; }
}

Query 1 (works):

_dbContext.Blogs
                .Where(b => new[] { "A", "B", "C" }.Contains(b.Status))
                .ToList();

Query 2 (exception):

_dbContext.Posts
                .Where(p => new[] { "A", "B", "C" }.Contains(p.Blog.Status))
                .ToList();

Stack trace:

Query source has already been associated with an expression
   at Remotion.Linq.Clauses.QuerySourceMapping.AddMapping(IQuerySource querySource, Expression expression)
   at Microsoft.Data.Entity.Query.EntityQueryModelVisitor.VisitJoinClause(JoinClause joinClause, QueryModel queryModel, Int32 index)
   at Microsoft.Data.Entity.Query.RelationalQueryModelVisitor.<>n__0(JoinClause joinClause, QueryModel queryModel, Int32 index)
   at Microsoft.Data.Entity.Query.RelationalQueryModelVisitor.<>c__DisplayClass58_0.<VisitJoinClause>b__0()
   at Microsoft.Data.Entity.Query.RelationalQueryModelVisitor.OptimizeJoinClause(JoinClause joinClause, QueryModel queryModel, Int32 index, Action baseVisitAction, MethodInfo operatorToFlatten, Boolean outerJoin)
   at Microsoft.Data.Entity.Query.RelationalQueryModelVisitor.VisitJoinClause(JoinClause joinClause, QueryModel queryModel, Int32 index)
   at Remotion.Linq.Clauses.JoinClause.Accept(IQueryModelVisitor visitor, QueryModel queryModel, Int32 index)
   at Remotion.Linq.QueryModelVisitorBase.VisitBodyClauses(ObservableCollection`1 bodyClauses, QueryModel queryModel)
   at Remotion.Linq.QueryModelVisitorBase.VisitQueryModel(QueryModel queryModel)
   at Microsoft.Data.Entity.Query.EntityQueryModelVisitor.VisitQueryModel(QueryModel queryModel)
   at Microsoft.Data.Entity.Query.RelationalQueryModelVisitor.VisitQueryModel(QueryModel queryModel)
   at Microsoft.Data.Entity.Query.Internal.SqlServerQueryModelVisitor.VisitQueryModel(QueryModel queryModel)
   at Microsoft.Data.Entity.Query.ExpressionVisitors.RelationalEntityQueryableExpressionVisitor.VisitSubQuery(SubQueryExpression subQueryExpression)
   at Remotion.Linq.Clauses.Expressions.SubQueryExpression.Accept(ExpressionVisitor visitor)
   at System.Linq.Expressions.ExpressionVisitor.Visit(Expression node)
   at Microsoft.Data.Entity.Query.ExpressionVisitors.ExpressionVisitorBase.Visit(Expression expression)
   at Microsoft.Data.Entity.Query.EntityQueryModelVisitor.ReplaceClauseReferences(Expression expression, IQuerySource querySource)
   at Microsoft.Data.Entity.Query.EntityQueryModelVisitor.VisitWhereClause(WhereClause whereClause, QueryModel queryModel, Int32 index)
   at Microsoft.Data.Entity.Query.RelationalQueryModelVisitor.VisitWhereClause(WhereClause whereClause, QueryModel queryModel, Int32 index)
   at Remotion.Linq.Clauses.WhereClause.Accept(IQueryModelVisitor visitor, QueryModel queryModel, Int32 index)
   at Remotion.Linq.QueryModelVisitorBase.VisitBodyClauses(ObservableCollection`1 bodyClauses, QueryModel queryModel)
   at Remotion.Linq.QueryModelVisitorBase.VisitQueryModel(QueryModel queryModel)
   at Microsoft.Data.Entity.Query.EntityQueryModelVisitor.VisitQueryModel(QueryModel queryModel)
   at Microsoft.Data.Entity.Query.RelationalQueryModelVisitor.VisitQueryModel(QueryModel queryModel)
   at Microsoft.Data.Entity.Query.Internal.SqlServerQueryModelVisitor.VisitQueryModel(QueryModel queryModel)
   at Microsoft.Data.Entity.Query.EntityQueryModelVisitor.CreateQueryExecutor[TResult](QueryModel queryModel)
   at Microsoft.Data.Entity.Storage.Database.CompileQuery[TResult](QueryModel queryModel)
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at Microsoft.Data.Entity.Query.QueryCompiler.<>c__DisplayClass16_0`1.<CompileQuery>b__0()
   at Microsoft.Data.Entity.Query.Internal.CompiledQueryCache.GetOrAddQuery[TResult](Object cacheKey, Func`1 compiler)
   at Microsoft.Data.Entity.Query.QueryCompiler.CompileQuery[TResult](Expression query)
   at Microsoft.Data.Entity.Query.QueryCompiler.Execute[TResult](Expression query)
   at Microsoft.Data.Entity.Query.Internal.EntityQueryProvider.Execute[TResult](Expression expression)
   at Remotion.Linq.QueryableBase`1.GetEnumerator()
   at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
   at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
   ...

[maumar]

Fixed in 7b65a5b0b4298700bb70b29435f4a8f0f53212ae