On Fri, Sep 2, 2016 at 10:10 AM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> 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.
I didn't miss it, I just never thought that anyone would care about
a secondary sort key if the primary sort key was random. I have
trouble imagining a use-case for that.
--
Kevin Grittner
EDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company