| From: | Simon Riggs <simon(at)2ndQuadrant(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Kyotaro HORIGUCHI <horiguchi(dot)kyotaro(at)lab(dot)ntt(dot)co(dot)jp>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Multi-column distinctness. |
| Date: | 2015-10-21 01:14:26 |
| Message-ID: | CANP8+jJBx0XNsnMHUYeC+V_jBryQhY_Wcy+LsgHNaHDNDgOcow@mail.gmail.com |
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| Lists: | pgsql-hackers |
On 20 October 2015 at 21:06, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> I am getting more attracted to your suggestion of making these things
> stand-alone commands "CREATE STATISTICS" and "DROP STATISTICS". Not only
> does that fix the syntactic problems of shoehorning them into ALTER TABLE,
> but it would be possible to design the syntax to allow for straightforward
> extension to multiple-table cases. Even if we don't know what we'd do
> with that just yet, it seems to me like a possible future extension that
> we should keep in mind. And anything based on ALTER TABLE just cannot do
> that reasonably.
>
+1
Good argument, so now I understand and agree with Tomas' original suggestion
So consider
>
> CREATE STATISTICS name ON table(columnlist) [, table(columnlist) ...]
> [ WITH options ]
>
Seems good
--
Simon Riggs http://www.2ndQuadrant.com/
<http://www.2ndquadrant.com/>
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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