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From: Aleksander Alekseev <aleksander@tigerdata.com>
Date: Tue, 24 Feb 2026 18:05:59 +0300
Message-ID: <CAJ7c6TONaV5oXtHf2b=BfjvgL_Pb+4G-xC1whUSuyzkAyUqorQ@mail.gmail.com>
Subject: Re: [PATCH] Refactor *_abbrev_convert() functions
To: PostgreSQL Development <pgsql-hackers@postgresql.org>
Cc: John Naylor <johncnaylorls@gmail.com>
Content-Type: multipart/mixed; boundary="00000000000051aa19064b933abb"
Archived-At: <https://www.postgresql.org/message-id/CAJ7c6TONaV5oXtHf2b%3DBfjvgL_Pb%2B4G-xC1whUSuyzkAyUqorQ%40mail.gmail.com>
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--00000000000051aa19064b933abb
Content-Type: text/plain; charset="UTF-8"

Hi,

> Thanks again.
>
> > I think it makes sense to squash 0001 and 0003 together, then 0002 and
> > 0004 together.
> > [...]
> > 0005 doesn't buy us as much in readability since the two lines no longer match.
>
> Makes sense.
>
> > For the first, we should probably combine in the upper half when using
> > a 64-bit hash, like this:
>
> We could do it if you insist but I'm convinced this is redundant. In a
> good hash upper 32 bits are as evenly distributed as lower ones so
> this combining doesn't buy us much. This may even cause more
> collisions, for values that didn't have them initially.
>
> > Further cleanup possible now that we have 64-bit datums: MAC addresses
> > are always 6 bytes, so abbreviation is no longer relevant -- datum1 is
> > authoritative. That's in scope for the thread subject but also a
> > bigger patch, but maybe someone would like to pick it up for PG20.
>
> I will pick it up and submit as a separate patch a bit later.

0002 had a wrong commit message due to a mistake during squashing.
Here is a corrected patch.

-- 
Best regards,
Aleksander Alekseev

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