Horton

Re: MULTISET and additional functions for ARRAY

Nicolas Barbier <nicolas.barbier@gmail.com>

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From: Nicolas Barbier <nicolas.barbier@gmail.com>
To: "David E. Wheeler" <david@kineticode.com>
Cc: Tom Lane <tgl@sss.pgh.pa.us>, PostgreSQL Hackers <pgsql-hackers@postgresql.org>
Date: 2010-11-11T18:24:00Z
Lists: pgsql-hackers 
2010/11/11 David E. Wheeler <david@kineticode.com>:

> On Nov 11, 2010, at 10:05 AM, Tom Lane wrote:
>
>>> So are you planning to implement multisets? It's a feature I'd love to see
>>
>> What actual functionality does it buy?  AFAICT from Itagaki-san's
>> description, it's an array only you ignore the specific element order.
>> So what?  You can write functions that work that way now.
>
> Also, no dupes.

The "multi" in multiset indicates that duplicate elements are
explicitly allowed and tracked.

Nicolas