Query: invalid sql for query with groupby aggregate pushdown, projecting Lenght property on top of that

[maumar]

query:

                var query = ctx.Orders.GroupBy(e => e.CustomerID)
                        .Where(g => g.Count() > 10)
                        .Select(g => g.Key)
                        .OrderBy(t => t)
                        .Take(20)
                        .Skip(4)
                        .Select(e => e.Length);

                var result = query.ToList();

generated sql:

SELECT [t].[c]
FROM (
    SELECT TOP(@__p_0) CAST(LEN([e].[CustomerID] AS [Key]) AS int) AS [c], [e].[CustomerID] AS [Key]
    FROM [Orders] AS [e]
    GROUP BY [e].[CustomerID]
    HAVING COUNT(*) > 10
    ORDER BY [c0]
) AS [t]
ORDER BY [t].[Key]
OFFSET @__p_1 ROWS

[smitpatel]

Duplicate of #12826