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From: Henson Choi <[email protected]>
To: Arne Roland <[email protected]>
Cc: pgsql-hackers <[email protected]>
Cc: Tomas Vondra <[email protected]>
Cc: Joel Jacobson <[email protected]>
Cc: Laurenz Albe <[email protected]>
Cc: Anders Granlund <[email protected]>
Cc: Andreas Karlsson <[email protected]>
Cc: Vik Fearing <[email protected]>
Subject: Re: Key joins
Date: Thu, 25 Jun 2026 23:09:01 +0900
Message-ID: <CAAAe_zD0e5pK3YQPYx+YEhvDnZknZNTJ6F4rtOygALWVHf3XDg@mail.gmail.com> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
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	<[email protected]>

Hi Arne,

Thank you for the thorough and thoughtful response. As you suggested:

> "You can read more about our design rationale in chapter 8 in the
> attached key_joins.pdf or online at https://keyjoin.org/#sec8. For an
> understanding of the usefulness of the feature I suggest sections 7.2
> to 7.6 again in the key_joins.pdf or online at https://keyjoin.org/#sec7.2
."

I will read through these sections carefully and come back with further
comments.

I genuinely admire the ambition of bringing this to WG3. Pushing a
Change Proposal to the SQL standard is no small undertaking, and I
respect the effort behind it. I hope the Stockholm meeting goes well.

On a personal note — I work on PostgreSQL upstream contributions myself,
and I have long been interested in the SQL standard as a living
document rather than a fixed reference. If I ever reach the point of
wanting to raise a small question or propose a correction based on
something I encounter in implementation work, would it be alright to
reach out to you?

Best regards,
Henson

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