From: | Andres Freund <andres(at)anarazel(dot)de> |
---|---|
To: | Bruce Momjian <bruce(at)momjian(dot)us> |
Cc: | pgsql-hackers(at)lists(dot)postgresql(dot)org, Adrien Nayrat <adrien(dot)nayrat(at)anayrat(dot)info> |
Subject: | Re: Postgres 11 release notes |
Date: | 2018-08-25 19:17:17 |
Message-ID: | 20180825191717.wcplc6i6mf4zo4kq@alap3.anarazel.de |
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Hi,
On 2018-08-25 14:47:20 -0400, Bruce Momjian wrote:
> Well, our normal logical is whether the average user would adjust their
> behavior based on this change, or whether it is user visible. I thought
> it was a contrived-enough query that this was not the case, but I would
> be interested to hear what others think.
I think that's less "our" logic and more yours, that has become
established because you've done most of the major release notes for a
long time. I'm not trying to say that that's wrong or anything, just
that a lot of those principles grew organically without explicit
decisions.
I also think that the need of userbase have shifted - it used to be that
a lot more people couldn't migrate to PG for lack of features, but these
days we have a much larger userbase that has to migrate from version to
version on a regular basis.
Planner changes, in my experience, are *the* major hurdle in doing so
(leaving aside things like the 8.3 casting changes), because they have
the potential to drastically change performance. In a largely
unpredictable way. So one of the first things you do after encountering
an issue while testing an issue during a migration, is to look through
the release notes whether that query could be affected by a documented
change.
Greetings,
Andres Freund
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