Обсуждение: [HACKERS] oidin / oidout and InvalidOid

Hi,

I was recently guilty of writing a less-than-clear SQL example
because I plain forgot whether InvalidOid was 0 (correct) or -1
(my bad).

Would there be any sense in letting oidin_subr accept the string
InvalidOid for 0? I understand that changing oidout could break
existing code outside of the tree. But what if oidout were to be
conservative in what it does, and oidin liberal in what it accepts?

-Chap

On 06/12/2017 01:41 PM, Chapman Flack wrote:
> I was recently guilty of writing a less-than-clear SQL example
> because I plain forgot whether InvalidOid was 0 (correct) or -1
> (my bad).
>
> Would there be any sense in letting oidin_subr accept the string
> InvalidOid for 0? I understand that changing oidout could break
> existing code outside of the tree. But what if oidout were to be
> conservative in what it does, and oidin liberal in what it accepts?

I am not sure I am a fan of this, but if we should have an alias for 
InvalidOid how about reusing '-' which is used by the reg*in functions? 
Or is that too non-obvious?

Andreas