On Sat, Aug 5, 2017 at 8:26 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> I'm quite disturbed though that the set of installed collations on these
> two test cases seem to be entirely different both from each other and from
> what you reported. The base collations look generally similar, but the
> "keyword variant" versions are not comparable at all. Considering that
> the entire reason we are interested in ICU in the first place is its
> alleged cross-version collation behavior stability, this gives me the
> exact opposite of a warm fuzzy feeling. We need to understand why it's
> like that and what we can do to reduce the variation, or else we're just
> buying our users enormous future pain. At least with the libc collations,
> you can expect that if you have en_US.utf8 available today you will
> probably still have en_US.utf8 available tomorrow. I am not seeing any
> reason to believe that the same holds for ICU collations.
+1. That seems like something that is important to get right up-front.
--
Peter Geoghegan
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