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From: Andy Fan <zhihuifan1213@163.com>
To: Tomas Vondra <tomas.vondra@enterprisedb.com>
Cc: Nikita Malakhov <hukutoc@gmail.com>
Cc: Michael Zhilin <m.zhilin@postgrespro.ru>
Cc: Peter Smith <smithpb2250@gmail.com>
Cc: vignesh C <vignesh21@gmail.com>
Cc: Matthias van de Meent <boekewurm+postgres@gmail.com>
Cc: pgsql-hackers@lists.postgresql.org
Subject: Re: Shared detoast Datum proposal
Date: Mon, 04 Mar 2024 09:17:27 +0800
Message-ID: <874jdmeqs8.fsf@163.com> (raw)
In-Reply-To: <f0297588-2da4-4d0f-9467-aac0ca33c542@enterprisedb.com>
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Tomas Vondra <tomas.vondra@enterprisedb.com> writes:

> On 3/3/24 02:52, Andy Fan wrote:
>> 
>> Hi Nikita,
>> 
>>>
>>> Have you considered another one - to alter pg_detoast_datum
>>> (actually, it would be detoast_attr function) and save
>>> detoasted datums in the detoast context derived
>>> from the query context? 
>>>
>>> We have just enough information at this step to identify
>>> the datum - toast relation id and value id, and could
>>> keep links to these detoasted values in a, say, linked list
>>>  or hash table. Thus we would avoid altering the executor
>>> code and all detoast-related code would reside within
>>> the detoast source files?
>> 
>> I think you are talking about the way Tomas provided.  I am really
>> afraid that I was thought of too self-opinionated, but I do have some
>> concerns about this approch as I stated here [1], looks my concerns is
>> still not addressed, or the concerns itself are too absurd which is
>> really possible I think? 
>> 
>
> I can't speak for others, but I did not consider you and your
> proposals too self-opinionated. 

This would be really great to know:)

> You did
> propose a solution that you consider the right one. That's fine. People
> will question that and suggest possible alternatives. That's fine too,
> it's why we have this list in the first place.

I agree.

-- 
Best Regards
Andy Fan






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