Query/InMemory: compilation error for complex groupby query

[maumar]

query:

ss.Set<Customer>()
                    .Select(
                        c => new
                        {
                            Key = c.CustomerID,
                            Subquery = c.Orders
                                .Select(o => new { First = o.OrderID, Second = o.Customer.City + o.CustomerID })
                                .GroupBy(x => x.Second)
                                .Select(g => new { Sum = g.Sum(x => x.First), Count = g.Count(x => x.Second.StartsWith("Lon")) }).ToList()
                        })

exception:

Expression of type 'System.Func`2[Microsoft.EntityFrameworkCore.Storage.ValueBuffer,System.Nullable`1[System.Boolean]]' cannot be used for parameter of type 'System.Func`2[Microsoft.EntityFrameworkCore.Storage.ValueBuffer,System.Boolean]' of method 'System.Collections.Generic.IEnumerable`1[Microsoft.EntityFrameworkCore.Storage.ValueBuffer] Where[ValueBuffer](System.Collections.Generic.IEnumerable`1[Microsoft.EntityFrameworkCore.Storage.ValueBuffer], System.Func`2[Microsoft.EntityFrameworkCore.Storage.ValueBuffer,System.Boolean])' (Parameter 'arg1')
  Stack Trace: 
    ExpressionUtils.ValidateOneArgument(MethodBase method, ExpressionType nodeKind, Expression arguments, ParameterInfo pi, String methodParamName, String argumentParamName, Int32 index)
    Expression.Call(MethodInfo method, Expression arg0, Expression arg1)
    InMemoryExpressionTranslatingExpressionVisitor.<VisitMethodCall>g__ApplyPredicate|35_1(GroupingElementExpression groupingElement, LambdaExpression lambdaExpression) line 653
    InMemoryExpressionTranslatingExpressionVisitor.VisitMethodCall(MethodCallExpression methodCallExpression) line 503
    InMemoryExpressionTranslatingExpressionVisitor.TranslateInternal(Expression expression) line 141
    InMemoryExpressionTranslatingExpressionVisitor.Translate(Expression expression) line 136
    InMemoryProjectionBindingExpressionVisitor.Visit(Expression expression) line 181
    InMemoryProjectionBindingExpressionVisitor.VisitNew(NewExpression newExpression) line 460
    InMemoryProjectionBindingExpressionVisitor.Visit(Expression expression) line 193
    InMemoryProjectionBindingExpressionVisitor.Translate(InMemoryQueryExpression queryExpression, Expression expression) line 69
    InMemoryQueryableMethodTranslatingExpressionVisitor.TranslateSelect(ShapedQueryExpression source, LambdaExpression selector) line 980
    QueryableMethodTranslatingExpressionVisitor.VisitMethodCall(MethodCallExpression methodCallExpression) line 405
    InMemoryQueryableMethodTranslatingExpressionVisitor.VisitMethodCall(MethodCallExpression methodCallExpression) line 93
    QueryableMethodTranslatingExpressionVisitor.TranslateSubquery(Expression expression) line 640
    InMemoryExpressionTranslatingExpressionVisitor.VisitMethodCall(MethodCallExpression methodCallExpression) line 704
    InMemoryExpressionTranslatingExpressionVisitor.VisitMethodCall(MethodCallExpression methodCallExpression) line 893
    InMemoryExpressionTranslatingExpressionVisitor.TranslateInternal(Expression expression) line 141
    InMemoryExpressionTranslatingExpressionVisitor.Translate(Expression expression) line 136
    InMemoryProjectionBindingExpressionVisitor.Visit(Expression expression) line 181
    InMemoryProjectionBindingExpressionVisitor.VisitNew(NewExpression newExpression) line 460
    InMemoryProjectionBindingExpressionVisitor.Visit(Expression expression) line 193
    InMemoryProjectionBindingExpressionVisitor.Translate(InMemoryQueryExpression queryExpression, Expression expression) line 69
    InMemoryQueryableMethodTranslatingExpressionVisitor.TranslateSelect(ShapedQueryExpression source, LambdaExpression selector) line 980
    QueryableMethodTranslatingExpressionVisitor.VisitMethodCall(MethodCallExpression methodCallExpression) line 405
    InMemoryQueryableMethodTranslatingExpressionVisitor.VisitMethodCall(MethodCallExpression methodCallExpression) line 93
    QueryCompilationContext.CreateQueryExecutor[TResult](Expression query) line 187
    Database.CompileQuery[TResult](Expression query, Boolean async) line 75
    QueryCompiler.CompileQueryCore[TResult](IDatabase database, Expression query, IModel model, Boolean async) line 114
    <>c__DisplayClass12_0`1.<ExecuteAsync>b__0() line 151
    CompiledQueryCache.GetOrAddQuery[TResult](Object cacheKey, Func`1 compiler) line 77
    QueryCompiler.ExecuteAsync[TResult](Expression query, CancellationToken cancellationToken) line 147
    EntityQueryProvider.ExecuteAsync[TResult](Expression expression, CancellationToken cancellationToken) line 100
    EntityQueryable`1.GetAsyncEnumerator(CancellationToken cancellationToken) line 111
    ConfiguredCancelableAsyncEnumerable`1.GetAsyncEnumerator()
    EntityFrameworkQueryableExtensions.ToListAsync[TSource](IQueryable`1 source, CancellationToken cancellationToken) line 1995

note: this scenario also fails in relational, in a controlled way

[smitpatel]

Poaching!