Fields order in composite primary key

[heahoh]

Hi!

Got an unexpected behavior (not documented as i see) when creating composite primary key

I has two entity with OneToMany relation - order and order.item
Both entity has external identity - order has unique digital number, item - non-unique SKU (but in order context it's unique)
`
Order
@id
private int externalId

@OneToMany
private Collection items
`

`
Item
@id
private string sku

@id
private Order order
`

For selectivity reasons I want to create primary_key like (order_id, sku) but doctrine:schema:update --dump-sql creates this one - primary_key(sku, order_id)
If I swap lines of order and sku fields declaration to this

`
Item
@id
private Order order

@id
private string sku
`
Than I get expected declaration of primary_key

Seems like sort of UB
Codestyle fixes can leads to changing table primary key and behavior not documented in documentation

[derrabus]

I don't really see why it's unexpected that ID fields are taken into account in the very order that you define them in.