Re: WITH ORDINALITY versus column definition lists

Tom Lane-2 wrote
> David Johnston <

> polobo@

> > writes:
>> Just to clarify we are still allowing simple aliasing:
> 
>> select * from generate_series(1,2) with ordinality as t(f1,f2); 
> 
> Right, that works (and is required by spec, I believe).  It's what to
> do with our column-definition-list extension that's at issue.
> 
>> Not sure if this is possible at this point but really the alias for the
>> ordinality column would be attached directly to the ordinality keyword.
> 
>> e.g., ...) with ordinality{alias} as t(a1, a2)
> 
> This has no support in the standard.

Now I'm just spinning some thoughts:

) with ordinality AS t(a1 text, a2 text | ord1)  -- type-less, but a
different separator

) with ordinality AS t(a1 text, a2 text)(ord1) -- stick it in its own
section, type-less

) with ordinality AS t(a1 text, a2 text) ordinal(ord1) --name the section
too

would probably want to extend the alias syntax to match...

Is there any precedent in other RDBMS to consider?

I don't see any obvious alternatives to the ones you listed and syntax is
really not a huge barrier.  If the implementation of an optionally specified
alias is a barrier then either someone needs to feel strongly enough to
implement it or just default to #1 for the time being.

But others really haven't had a chance to read and respond yet so I'm gonna
get off this train for a while.


David J.





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