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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Kevin Grittner <kgrittn@gmail.com>
Cc: Andres Freund <andres@anarazel.de>
Cc: Robert Haas <robertmhaas@gmail.com>
Cc: pgsql-hackers@postgresql.org <pgsql-hackers@postgresql.org>
Subject: Re: Implement targetlist SRFs using ROWS FROM() (was Changed SRF in targetlist handling)
Date: Fri, 02 Sep 2016 11:10:54 -0400
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Kevin Grittner <kgrittn@gmail.com> writes:
> On Fri, Sep 2, 2016 at 9:51 AM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>> regression=# select *, generate_series(1,3) from int8_tbl;

> I'm sure that you realize that running a query of that form twice
> against a table with more than one heap page could result in rows
> in a different order, even if no changes had been made to the
> database (including no vacuum activity, auto- or otherwise).

You missed my point: they might complain about the generate_series
output not being in the order they expect, independently of what
the table rows are.

Also, before getting too high and mighty with users who expect
"select * from table" to produce rows in a predictable order,
you should reflect on the number of places in our regression
tests that assume exactly that ...

			regards, tom lane


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  Subject: Re: Implement targetlist SRFs using ROWS FROM() (was Changed SRF in targetlist handling)
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