Re: No longer possible to query catalogs for index capabilities?

On 07/25/2016 12:19 PM, Tom Lane wrote:
> Robert Haas <robertmhaas@gmail.com> writes:
>> On Mon, Jul 25, 2016 at 10:35 AM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>>> You missed the "compelling argument why it's needed" part.  What is the
>>> need for this?
>
>> It's self-evident that this thread wouldn't exist if it were not the
>> case that people had queries that no longer work because of these new
>> changes.  You can hold your breath and pretend that every single one
>> of those queries is probably misdesigned, but I do not think anyone
>> else will find that argument convincing.
>
> We've already broken existing queries against pg_am, simply because the
> columns are not there anymore; and that decision is not getting undone
> at this point.  I'm willing to consider putting back some substitute
> capability, but I'd like to see as much evidence for adding that as we'd
> expect for any other new feature.  Andrew still hasn't shown a concrete
> example of what he needs to do and why.

I think that Andrew and other people who have commented on this thread 
made it pretty obvious why it is useful.

JD

>
>             regards, tom lane
>
>


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