We are using this issue to cover specifically end-to-end support for hierarchyid. SQL Server UDTs are covered by #12796, and spatial is covered by #1100. As noted in #365 (comment), we already support ...

Enable hierarchyid support by calling UseHierarchyId inside UseSqlServer. UseSqlServer is is typically called inside Startup.ConfigureServices or OnConfiguring of your DbContext type.

Entity Framework Core 8 Preview 2 was released on March 14th. The most notable feature in EF Core 8 preview 2 is support for SQL Server hierarchical data. The EntityFrameworkCore.SqlServer.HierarchyId ...