From: | Andrew Dunstan <andrew(at)dunslane(dot)net> |
---|---|
To: | Noah Misch <noah(at)leadboat(dot)com> |
Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: [COMMITTERS] pgsql: Don't downcase non-ascii identifier chars in multi-byte encoding |
Date: | 2013-06-09 13:51:06 |
Message-ID: | 51B4884A.4080206@dunslane.net |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-committers pgsql-hackers |
On 06/09/2013 12:38 AM, Noah Misch wrote:
> On Sat, Jun 08, 2013 at 11:50:53PM -0400, Andrew Dunstan wrote:
>> On 06/08/2013 10:52 PM, Noah Misch wrote:
>>> Let's return to the drawing board on this one. I would be inclined to keep
>>> the current bad behavior until we implement the i18n-aware case folding
>>> required by SQL. If I'm alone in thinking that, perhaps switch to downcasing
>>> only ASCII characters regardless of the encoding. That at least gives
>>> consistent application behavior.
>>>
>>> I apologize for not noticing to comment on this week's thread.
>>>
>> The behaviour which this fixes is an unambiguous bug. Calling tolower()
>> on the individual bytes of a multi-byte character can't possibly produce
>> any sort of correct result. A database that contains such corrupted
>> names, probably not valid in any encoding at all, is almost certainly
>> not restorable, and I'm not sure if it's dumpable either.
> I agree with each of those points. However, since any change here breaks
> compatibility, we should fix it right the first time. A second compatibility
> break would be all the more onerous once this intermediate step helps more
> users to start using unquoted, non-ASCII object names.
>
>> It's already
>> produced several complaints in recent months, so ISTM that returning to
>> it for any period of time is unthinkable.
> PostgreSQL has lived with this wrong behavior since ... the beginning? It's a
> problem, certainly, but a bandage fix brings its own trouble.
If you have a better fix I am all ears. I can recall at least one
discussion of this area (concerning Turkish I quite a few years ago)
where we failed to come up with anything.
I have a fairly hard time believing in your "relies on this and somehow
works" scenario.
cheers
andrew
From | Date | Subject | |
---|---|---|---|
Next Message | Tom Lane | 2013-06-09 15:39:18 | Re: Re: [COMMITTERS] pgsql: Don't downcase non-ascii identifier chars in multi-byte encoding |
Previous Message | Noah Misch | 2013-06-09 04:38:19 | Re: [COMMITTERS] pgsql: Don't downcase non-ascii identifier chars in multi-byte encoding |
From | Date | Subject | |
---|---|---|---|
Next Message | Kevin Grittner | 2013-06-09 13:56:11 | Re: Batch API for After Triggers |
Previous Message | Andres Freund | 2013-06-09 13:25:54 | Re: [PATCH] add --throttle to pgbench (submission 3) |