Re: psql, remove include of psqlscan.c

Excerpts from Karl O. Pinc's message of jue sep 27 12:29:53 -0300 2012:

> The reason I want this is because I don't want to have to
> rewrite the sql parser in PHP for inclusion in phpPgAdmin.
> (I did this once, and it was such a big ugly patch
> it never got around to getting into the mainline phpPgAdmin.)
> phpPgAdmin (pgAdmin/ front-end of your choice)
> should be able process a string of sql statements in the
> same way that psql does, but currently the only way to
> do this is to rewrite the parser in each application.
> Much better to have libpq provide the functionality,
> although I suppose it's possible to push this into the
> server.

This seems a worthy goal to me.

But I think I see what Tom objection to it is: if we "export" this
capability to libpq applications, then we set it in stone to a certain
extent: exactly how things are split would become part of the API, so to
speak.  Upgrading to a newer libpq could break application code that
worked with the previous release's by splitting things differently.

I don't currently have an opinion on whether this is a bad thing or not.
Who wants to argue for/against?

--
Álvaro Herrera                http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services