Re: logical column ordering

On 3/3/15 11:26 AM, Bruce Momjian wrote:
> On Tue, Mar 3, 2015 at 11:24:38AM -0600, Jim Nasby wrote:
>> On 3/3/15 11:23 AM, Bruce Momjian wrote:
>>> On Thu, Feb 26, 2015 at 01:55:44PM -0800, Josh Berkus wrote:
>>>> On 02/26/2015 01:54 PM, Alvaro Herrera wrote:
>>>>> This patch decouples these three things so that they
>>>>> can changed freely -- but provides no user interface to do so. I think
>>>>> that trying to only decouple the thing we currently have in two pieces,
>>>>> and then have a subsequent patch to decouple again, is additional
>>>>> conceptual complexity for no gain.
>>>>
>>>> Oh, I didn't realize there weren't commands to change the LCO. Without
>>>> at least SQL syntax for LCO, I don't see why we'd take it; this sounds
>>>> more like a WIP patch.
>>>
>>> FYI, pg_upgrade is going to need pg_dump --binary-upgrade to output the
>>> columns in physical order with some logical ordering information, i.e.
>>> pg_upgrade cannot be passed only logical ordering from pg_dump.
>>
>> Wouldn't it need attno info too, so all 3 orderings?
>
> Uh, what is the third ordering? Physical, logical, and ? It already
> gets information about dropped columns, if that is the third one.

attnum; used in other catalogs to reference columns.

If you're shuffling everything though pg_dump anyway then maybe it's not
needed...
--
Jim Nasby, Data Architect, Blue Treble Consulting
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