Re: Implement targetlist SRFs using ROWS FROM() (was Changed SRF in targetlist handling) - Mailing list pgsql-hackers

From Kevin Grittner
Subject Re: Implement targetlist SRFs using ROWS FROM() (was Changed SRF in targetlist handling)
Date
Msg-id CACjxUsP7v6fx4nn0sGkeWxMi3jUfQRSHj5yo4s64HXZ+NFa-KQ@mail.gmail.com
Whole thread Raw
In response to Re: Implement targetlist SRFs using ROWS FROM() (was Changed SRF in targetlist handling)  (Tom Lane <tgl@sss.pgh.pa.us>)
List pgsql-hackers
On Fri, Sep 2, 2016 at 10:10 AM, Tom Lane <tgl@sss.pgh.pa.us> wrote:

> 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 ...

An assumption that not infrequently breaks.  AFAIK, we generally
adjust the tests when that happens, rather than considering it a
bug in the code.  I never thought we did that because there was a
secret, undocumented guarantee of order, but to allow different
code paths to be tested than we would test if we always specified
an order.

--
Kevin Grittner
EDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company



pgsql-hackers by date:

Previous
From: Anderson Carniel
Date:
Subject: Re: What is the posix_memalign() equivalent for the PostgreSQL?
Next
From: Maksim Milyutin
Date:
Subject: Re: [WIP] Patches to enable extraction state of query execution from external session