Re: Patch to support SEMI and ANTI join removal

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От Robert Haas
Тема Re: Patch to support SEMI and ANTI join removal
Дата
Msg-id CA+TgmoasyBUWHeKqzhK3ZzV2RHN2LCh==uS+Xp5O0noxopHe5Q@mail.gmail.com
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Ответ на Re: Patch to support SEMI and ANTI join removal  (Andres Freund <andres@2ndquadrant.com>)
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On Mon, Oct 6, 2014 at 10:59 AM, Andres Freund <andres@2ndquadrant.com> wrote:
> On 2014-10-06 10:46:09 -0400, Robert Haas wrote:
>> This seems messy, though.  Can't the deferred trigger queue become
>> non-empty at pretty much any point in time?  At exactly what point are
>> we making this decision, and how do we know the correct answer can't
>> change after that point?
>
> What we've been talking about is doing this during executor startup. And
> at that point we really don't care about new entries in the queue during
> query execution - we can't see them anyway.

Ah, OK.

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



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