如何在RavenDb MapReduce中执行MaxBy

from doc in docs
select new
{
    doc.Name,
    MaxAge = doc.Age
}

from result in results
group result by result.Name into g
select new
{
    Name = g.Key,
    MaxAge = g.Max(x => x.MaxAge)
}

var results = session.Query<YourDocument>()
    .Where(x => x.SomeCondition)
    .Select(x => new
    {
        x.Name,
        MaxAge = x.Age
    })
    .ToList();

var maxAges = results.GroupBy(x => x.Name)
    .Select(g => new
    {
        Name = g.Key,
        MaxAge = g.Max(x => x.MaxAge)
    })
    .ToList();