Re: extend pgbench expressions with functions

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От Robert Haas
Тема Re: extend pgbench expressions with functions
Дата
Msg-id CA+TgmoY4pAZuA-z+uu9Vk6B_=jXwGN77vQ2P6driqCLtCezYaw@mail.gmail.com
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Ответ на Re: extend pgbench expressions with functions  (Michael Paquier <michael.paquier@gmail.com>)
Ответы Re: extend pgbench expressions with functions  (Michael Paquier <michael.paquier@gmail.com>)
Список pgsql-hackers
On Mon, Dec 14, 2015 at 7:25 AM, Michael Paquier
<michael.paquier@gmail.com> wrote:
> On Mon, Nov 9, 2015 at 6:46 AM, Robert Haas <robertmhaas@gmail.com> wrote:
>> On Sat, Nov 7, 2015 at 2:45 AM, Fabien COELHO <coelho@cri.ensmp.fr> wrote:
>>> After looking at the generated html version, I find that the "1/param" and
>>> "2/param" formula are very simple and pretty easy to read, and they would
>>> not be really enhanced with additional spacing.
>>>
>>> ISTM that adaptative spacing (no spacing for level 1 operations, some for
>>> higher level) is a good approach for readability, ie:
>>>
>>>    f(i) - f(i+1)
>>>              ^ no spacing here
>>>         ^ some spacing here
>>>
>>> So I would suggest to keep the submitted version, unless this is a blocker.
>>
>> Well, I think with the ".0" version it looks more like floating-point
>> math, and I like the extra white-space.  But I'm happy to hear other
>> opinions.
>
> -      defined as <literal>(max + min) / 2.0</>, then value <replaceable>i</>
> +      defined as <literal>(max+min)/2</>, with
> This thing reminds me a bit of the little of TeX I know, when writing
> things like "\sqrt{1-e^2}" spaces would be printed in the converted
> html, and as that's floating arythmetic, we should have as well a .0.
> So I would agree on both points with Robert.
>
> I have looked for now at the first patch and finished with the
> attached while looking at it. Perhaps a committer could look already
> at that?

It looks fine to me except that I think we should spell out "param" as
"parameter" throughout, instead of abbreviating.

-- 
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company



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