| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Hans-Jürgen Schönig <hs(at)cybertec(dot)at>, Greg Stark <gsstark(at)mit(dot)edu>, Boszormenyi Zoltan <zb(at)cybertec(dot)at>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Path question |
| Date: | 2010-09-25 02:23:07 |
| Message-ID: | AANLkTimL+WYk_5mOsqJCoU+4vO7B7ffM7anGXcVQf8pN@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Fri, Sep 24, 2010 at 5:05 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> It's not that hard if you just tweak equivclass.c to make the order of
> equivalence-class lists different, viz
[...]
> Since the order of equivalence-class member lists isn't supposed to be
> semantically significant, I claim that the code in createplan has to
> be able to deal with this.
[...]
> That's not a reason for it not to handle
> the case, though.
I'm not disputing that those tests are correct. All I'm saying is
that I can't figure out a way to write regression tests that fail if
they are removed.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise Postgres Company
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