Alvaro Herrera <alvherre@2ndquadrant.com> writes:
> Andres Freund escribi�:
>> Dimitri's earlier patches had support for quite some commands via
>> deparsing and while its a noticeable amount of code it seemed to work
>> ok.
>> The last revision I could dig out is
>>
https://github.com/dimitri/postgres/blob/d2996303c7bc6daa08cef23e3d5e07c3afb11191/src/backend/utils/adt/ddl_rewrite.c
> I looked at that code back then and didn't like it very much. The
> problem I see (as Robert does, I think) is that it raises the burden
> when you change the grammar -- you now need to edit not only gram.y, but
> the ddl_rewrite.c stuff to ensure your new thing can be reverse-parsed.
Well, that burden already exists for non-utility statements --- why
should utility statements get a pass? Other than that we tend to invent
new utility syntax freely, which might be a good thing to discourage
anyhow.
regards, tom lane