Re: Planning time in explain/explain analyze

On Mon, Dec 23, 2013 at 10:47 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Robert Haas <robertmhaas(at)gmail(dot)com> writes:
>> On Mon, Dec 23, 2013 at 9:54 PM, Andreas Karlsson <andreas(at)proxel(dot)se> wrote:
>>> Yeah, forgot to mention that we need some way to disable it in the tests.
>>> Either by not having it included in EXPLAIN or by adding an option to turn
>>> it off. Any suggestion on which would be preferable?
>
>> I would be tempted to display it only if (COSTS OFF) is not given.
>
> Yeah. The alternatives seem to be:
>
> 1. Change a lot of regression tests. This would be a serious PITA,
> not so much for the one-time cost as for every time we needed to
> back-patch a regression test that includes explain output. -1.
>
> 2. Don't display the planning time by default, necessitating a new
> PLANNING_TIME ON option. This has backwards compatibility to
> recommend it, but not much else.
>
> 3. Let COSTS OFF suppress it.

Another option would be to not display it by default, but make VERBOSE
show it. However, I think making it controlled by COSTS is a better
fit.

--
Robert Haas
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