From: | Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com> |
---|---|
To: | Rafia Sabih <rafia(dot)pghackers(at)gmail(dot)com> |
Cc: | Michael Paquier <michael(at)paquier(dot)xyz>, John Naylor <john(dot)naylor(at)2ndquadrant(dot)com>, Sergei Agalakov <sergei(dot)agalakov(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: explain plans with information about (modified) gucs |
Date: | 2019-03-26 20:04:53 |
Message-ID: | 20190326200453.GA16551@development |
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Lists: | pgsql-hackers |
On Mon, Mar 18, 2019 at 11:31:48AM +0100, Rafia Sabih wrote:
>On Sun, 24 Feb 2019 at 00:06, Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com> wrote:
>>
>> Hi,
>>
>> attached is an updated patch, fixing and slightly tweaking the docs.
>>
>>
>> Barring objections, I'll get this committed later next week.
>>
>I was having a look at this patch, and this kept me wondering,
>
>+static void
>+ExplainShowSettings(ExplainState *es)
>+{
>Is there some reason for not providing any explanation above this
>function just like the rest of the functions in this file?
>
>Similarly, for
>
>struct config_generic **
>get_explain_guc_options(int *num)
>{
>
>/* also bail out of there are no options */
>+ if (!num)
>+ return;
>I think you meant 'if' instead if 'of' here.
Thanks for the review - attached is a patch adding the missing comments,
and doing two additional minor improvements:
1) Renaming ExplainShowSettings to ExplainPrintSettings, to make it more
consistent with naming of the other functions in explain.c.
2) Actually counting GUC_EXPLAIN options, and only allocating space for
those in get_explain_guc_options, instead of using num_guc_variables. The
diffrence is quite significant (~50 vs. ~300), and considering each entry
is 8B it makes a difference because such large chunks tend to have higher
palloc overhed (due to ALLOCSET_SEPARATE_THRESHOLD).
regards
--
Tomas Vondra http://www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
Attachment | Content-Type | Size |
---|---|---|
explain-with-settings-20190326.patch | text/plain | 4.0 KB |
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