Re: ICU integration

From: Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com>
To: Peter Geoghegan <pg(at)heroku(dot)com>, Craig Ringer <craig(at)2ndquadrant(dot)com>
Cc: Tatsuo Ishii <ishii(at)sraoss(dot)co(dot)jp>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Doug Doole <ddoole(at)salesforce(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>, Devrim Gündüz <devrim(at)gunduz(dot)org>
Subject: Re: ICU integration
Date: 2016-09-09 12:45:54
Message-ID: 08dc02e5-3347-666d-7eae-ea08b8e8a64e@2ndquadrant.com
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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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