| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Jim Nasby <jim(at)nasby(dot)net> |
| Cc: | Alexey Klyukin <alexk(at)commandprompt(dot)com>, Noah Misch <noah(at)leadboat(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Identifying no-op length coercions |
| Date: | 2011-06-03 16:13:44 |
| Message-ID: | BANLkTikuy3f1vYtb807mPDU3nkmvHbNxsg@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Fri, Jun 3, 2011 at 11:43 AM, Jim Nasby <jim(at)nasby(dot)net> wrote:
> On Jun 3, 2011, at 10:11 AM, Alexey Klyukin wrote:
>>> Is your interest in cheap varchar(N)->varchar(N+M) conversions specifically, or
>>> in some broader application of this facility?
>>
>> Exactly varchar conversions.
>
> Why limit it to varchar? Shouldn't we be able to do this for any varlena? The only challenge I see is numeric; we'd need to ensure that both size and precision are not decreasing.
More than that: you should also be able to make it work for things
like xml -> text.
Indeed, I believe Noah has plans to do just that.
Which, quite frankly, will be awesome.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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