MartenSearching for NULL Values
Regardless of your feelings about NULL, they do exist in databases and Marten allows you to search for documents that have (or don't have) null values:
cs
public void query_by_nullable_type_nulls(IDocumentSession session)
{
// You can use Nullable<T>.HasValue in Linq queries
session.Query<Target>().Where(x => !x.NullableNumber.HasValue).ToArray();
session.Query<Target>().Where(x => x.NullableNumber.HasValue).ToArray();
// You can always search by field is NULL
session.Query<Target>().Where(x => x.Inner == null);
}