From: | Bruce Momjian <bruce(at)momjian(dot)us> |
---|---|
To: | Andrew Gierth <andrew(at)tao11(dot)riddles(dot)org(dot)uk> |
Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Stephen Frost <sfrost(at)snowman(dot)net>, Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: No longer possible to query catalogs for index capabilities? |
Date: | 2016-08-06 14:53:55 |
Message-ID: | 20160806145355.GG26927@momjian.us |
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Lists: | pgsql-hackers |
On Sat, Aug 6, 2016 at 01:00:15PM +0100, Andrew Gierth wrote:
> >>>>> "Bruce" == Bruce Momjian <bruce(at)momjian(dot)us> writes:
>
> >> As far as I understood Andrew's use case, he was specifically *not*
> >> interested in a complete representation of an index definition, but
> >> rather about whether it had certain properties that would be of
> >> interest to query-constructing applications.
>
> Well, I wouldn't limit it to query-constructing applications.
>
> I'll give another random example that I thought of. Suppose an
> administrative GUI (I have no idea if any of the existing GUIs do this)
> has an option to do CLUSTER on a table; how should it know which indexes
> to offer the user to cluster on, without access to amclusterable?
>
> Bruce> Would it be helpful to output an array of strings representing
> Bruce> the index definition?
>
> Why would that help, if the point is to enable programmatic access to
> information?
I was thinking an array of strings would avoid problems in having to
re-scan the output for tokens.
--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://enterprisedb.com
+ As you are, so once was I. As I am, so you will be. +
+ Ancient Roman grave inscription +
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