Re: Change the bool member of the Query structure to bits

From: Quan Zongliang <quanzongliang(at)yeah(dot)net>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: pgsql-hackers(at)lists(dot)postgresql(dot)org
Subject: Re: Change the bool member of the Query structure to bits
Date: 2024-02-20 23:45:22
Message-ID: c82c4dc1-c3a1-45ef-9f22-d9156eb810b4@yeah.net
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On 2024/2/20 23:45, Tom Lane wrote:
> Quan Zongliang <quanzongliang(at)yeah(dot)net> writes:
>> The Query structure has an increasing number of bool attributes. This is
>> likely to increase in the future. And they have the same properties.
>> Wouldn't it be better to store them in bits? Common statements don't use
>> them, so they have little impact. This also saves memory space.
>
> I'm -1 on that, for three reasons:
>
> * The amount of space saved is quite negligible. If queries had many
> Query structs then it could matter, but they don't.
>
> * This causes enough code churn to create a headache for back-patching.
>
> * This'll completely destroy the readability of these flags in
> pprint output.
>
> I'm not greatly in love with the macro layer you propose, either,
> but those details don't matter because I think we should just
> leave well enough alone.
>
> regards, tom lane
I get it. Withdraw.

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