| From: | Jeff Janes <jeff(dot)janes(at)gmail(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Ashutosh Bapat <ashutosh(dot)bapat(at)enterprisedb(dot)com>, Dmitry Dolgov <9erthalion6(at)gmail(dot)com>, Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: why partition pruning doesn't work? |
| Date: | 2018-06-02 21:16:51 |
| Message-ID: | CAMkU=1z3SR9jGSG7CHQaba-cq9wPTTbYcSbWPLXiLcmMtRVDYQ@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Fri, Jun 1, 2018 at 11:53 AM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>
> I agree though that it seems strange to special-case SQLValueFunction
> rather than any-stable-expression. As long as the evaluation happens
> at executor start (i.e. with the query's run-time snapshot) it should
> be reasonable to simplify any stable expression.
>
> It's worth questioning whether this is a bug fix or an improvement.
> If the latter, it probably ought to wait for v12.
>
If explaining the change requires reference to tokens from the source code,
rather than something an end user could understand, I'd argue it is a bug
fix rather than an improvement.
Cheers,
Jeff
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