Re: Hook for extensible parsing.

On Thu, 16 Sept 2021 at 05:33, Julien Rouhaud <rjuju123(at)gmail(dot)com> wrote:

> Would any of that be a reasonable approach?

The way I summarize all of the above is that
1) nobody is fundamentally opposed to the idea
2) we just need to find real-world example(s) and show that any
associated in-core patch provides all that is needed in a clean way,
since that point is currently in-doubt by senior committers.

So what is needed is some actual prototypes that explore this. I guess
that means they have to be open source, but those examples could be
under a different licence, as long as the in-core patch is clearly a
project submission to PostgreSQL.

I presume a few real-world examples could be:
* Grammar extensions to support additional syntax for Greenplum, Citus, XL
* A grammar that adds commands for an extension, such as pglogical
(Jim's example)
* A strict SQL Standard grammar/parser
* GQL implementation

--
Simon Riggs http://www.EnterpriseDB.com/