RE: Allow escape in application_name

Dear Horiguchi-san,

> I'm not sure. All of it is a if-story. z/OS's isdigit is defined as
> "Test for a decimal digit, as defined in the digit locale source file
> and in the digit class of the LC_CTYPE category of the current
> locale.", which I read it as "it accepts multibyte strings" but of
> course I'm not sure that's correct.
>
> On CentOS8, and for Japanese letters, both iswdigit(L'ー') and
> iswdigit(L'０') return false so, assuming the same character
> classfication scheme that is implementation dependent, I guess z/OS's
> isdigit would behave the same way with CentOS's isdigit.
>
> Hoever, regardless of the precise behavior,
>
> > But, of cause I agreed this is the crazy case.
>
> Yes, I meant that that doesn't matter.

Hmm.. of cause I want to do because I believe this is corner case,
but we should avoid regression...
If no one can say it completely some existing methods probably should be used.
Therefore, I would like to suggest using the export and support functions again.
The name is converted to parse_XXX and it locates in elog.c. How is it?

Best Regards,
Hayato Kuroda
FUJITSU LIMITED