From: Peter Eisentraut <peter.eisentraut@2ndquadrant.com>
To: Peter Geoghegan <pg@heroku.com>
To: Craig Ringer <craig@2ndquadrant.com>
Cc: Tatsuo Ishii <ishii@sraoss.co.jp>
Cc: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Doug Doole <ddoole@salesforce.com>
Cc: PostgreSQL Hackers <pgsql-hackers@postgresql.org>
Cc: Devrim Gündüz <devrim@gunduz.org>
Subject: Re: ICU integration
Date: Fri, 9 Sep 2016 08:45:54 -0400
Message-ID: <08dc02e5-3347-666d-7eae-ea08b8e8a64e@2ndquadrant.com> (raw)
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On 9/8/16 11:08 PM, Peter Geoghegan wrote:
> In principle, and assuming I haven't gotten something wrong, it ought
> to be possible to unambiguously identify a collation based on a
> matching UCA version (i.e. DUCET table), plus the collation tailorings
> matching exactly, even across ICU versions that happen to be based on
> the same UCA version (they only seem to put out a new UCA version
> about once a year [4]). It *might* be fine, practically speaking, to
> assume that a collation with a matching iso-code and UCA version is
> compatible forever and always across any ICU version. If not, it might
> instead be feasible to write a custom fingerprinter for collation
> tailorings that ran at initdb time.
The documentation [0] states that the collation version covers a broad
range of things. So I don't think these additional mechanisms you
describe are necessary.
[0]: http://userguide.icu-project.org/collation/architecture#TOC-Versioning
--
Peter Eisentraut http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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Cc: peter.eisentraut@2ndquadrant.com, pg@heroku.com, craig@2ndquadrant.com, ishii@sraoss.co.jp, tgl@sss.pgh.pa.us, ddoole@salesforce.com, devrim@gunduz.org
Subject: Re: ICU integration
In-Reply-To: <08dc02e5-3347-666d-7eae-ea08b8e8a64e@2ndquadrant.com>
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