Re: [COMMITTERS] pgsql: Fix freezing of a dead HOT-updated tuple

On Thu, Nov 2, 2017 at 4:50 PM, Andres Freund <andres@anarazel.de> wrote:
> I think a5736bf754c82d8b86674e199e232096c679201d might be dangerous in
> the face of previously corrupted tuple chains and pg_upgraded clusters -
> it can lead to tuples being considered related, even though they they're
> from entirely independent hot chains. Especially when upgrading 9.3 post
> your fix, to current releases.

I think this is a key point.  If the new behavior were merely not
entirely correct, we could perhaps refine it later.  But it's not only
not correct - it actually has the potential to create new problems
that didn't exist before those commits.  And if we release without
reverting those commits then we can't change our mind later.

-- 
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company


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