| From: | Amit Langote <Langote_Amit_f8(at)lab(dot)ntt(dot)co(dot)jp> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | David Rowley <david(dot)rowley(at)2ndquadrant(dot)com>, Yuzuko Hosoya <hosoya(dot)yuzuko(at)lab(dot)ntt(dot)co(dot)jp>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: Runtime pruning problem |
| Date: | 2019-04-19 08:03:07 |
| Message-ID: | 7d85bc34-3d53-d0ca-8963-7d23debe005e@lab.ntt.co.jp |
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| Lists: | pgsql-hackers |
On 2019/04/19 3:13, Robert Haas wrote:
> On Tue, Apr 16, 2019 at 10:49 PM Amit Langote
> <Langote_Amit_f8(at)lab(dot)ntt(dot)co(dot)jp> wrote:
>> Maybe, not show them? That may be a bit inconsistent, because the point
>> of VERBOSE is to the targetlist among other things, but maybe the users
>> wouldn't mind not seeing it on such empty Append nodes. OTOH, they are
>> more likely to think seeing a subplan that's clearly prunable as a bug of
>> the pruning logic.
>
> Or maybe we could show them, but the Append could also be flagged in
> some way that indicates that its child is only a dummy.
>
> Everything Pruned: Yes
>
> Or something.
Such an approach has been proposed too, although not with a new property text.
Thanks,
Amit
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