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From: Jeff Davis <[email protected]>
To: Nathan Bossart <[email protected]>
To: Hari Krishna Sunder <[email protected]>
Cc: Corey Huinker <[email protected]>
Cc: Robert Treat <[email protected]>
Cc: Robert Haas <[email protected]>
Cc: Andres Freund <[email protected]>
Cc: Tom Lane <[email protected]>
Cc: Michael Paquier <[email protected]>
Cc: jian he <[email protected]>
Cc: Bruce Momjian <[email protected]>
Cc: Matthias van de Meent <[email protected]>
Cc: Magnus Hagander <[email protected]>
Cc: Stephen Frost <[email protected]>
Cc: Ashutosh Bapat <[email protected]>
Cc: Peter Smith <[email protected]>
Cc: PostgreSQL Hackers <[email protected]>
Cc: [email protected]
Subject: Re: Statistics Import and Export
Date: Wed, 21 May 2025 14:14:55 -0700
Message-ID: <[email protected]> (raw)
In-Reply-To: <aC36dza2Fw32YMY9@nathan>
References: <Z_BcWVMvlUIJ_iuZ@nathan>
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	<CAAeiqZ0jqtJaigLa6WDAskRFM4gDCj3hNxmwiWs+wHU0gxCTKQ@mail.gmail.com>
	<aC36dza2Fw32YMY9@nathan>

On Wed, 2025-05-21 at 11:08 -0500, Nathan Bossart wrote:
> On Tue, May 20, 2025 at 10:32:39AM -0700, Hari Krishna Sunder wrote:
> > Ah ya, forgot that reltuples are not always accurate. This sounds
> > reasonable to me.
> 
> Cool.  Here is what I have staged for commit, which I am planning to
> do
> shortly.

Originally, one of the reasons we added a version field during dump is
so that some future version could reinterpret stats in older dump files
during import.

This patch is using a newer version of pg_dump to interpret stats from
older versions during export. That might be fine, but it would be good
to understand where the line is between things we should reinterpret
during export vs things we should reinterpret during import.

Regards,
	Jeff Davis

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