Inheritance SingleTable and not null DiscriminatorColumn

BIZ TMS Aurelius
1

If I make an entity to an entity using Inheritance, the discriminator column is made not null by default:

  [Entity]
  [Inheritance(TInheritanceStrategy.SingleTable)]
  [DiscriminatorColumn('TYPE', TDiscriminatorType.dtString)]
  TEntity = class
  ...;

TObjectManager.Update executes this statement:

ALTER TABLE ENTITY
  ADD TYPE VARCHAR(30) NOT NULL

this does not work for existing data, as all new fields do, that are not nullable.

For some tests I created the column by myself with default = ' '. (CHR(32))

I got a little bit confused, why
ObjectManager.Find<TEntity>.Select(Linq['ID'].Count).UniqueValue;

came up with this statement:

SELECT count(A.ID as f0_)
FROM ENTITY A
WHERE A.Type in (:p_0, :p_1, :p_2)
p_0 = NULL
p_1 = "CCtc"
p_2 = "PCtc"

How can I set the DiscriminatorColumn nullable, because it looks like it should be possible?

2

Aurelius always creates the discriminator column as not nullable.
The created SQL is just in case, because Aurelius also works with existing databases.