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Re: Order changes in PG16 since ICU introduction

Jeff Davis <pgsql@j-davis.com>

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From: Jeff Davis <pgsql@j-davis.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Daniel Verite <daniel@manitou-mail.org>, Andrew Gierth <andrew@tao11.riddles.org.uk>, Peter Eisentraut <peter.eisentraut@enterprisedb.com>, Sandro Santilli <strk@kbt.io>, Regina Obe <lr@pcorp.us>, pgsql-hackers@lists.postgresql.org
Date: 2023-05-15T21:16:31Z
Lists: pgsql-hackers 
On Mon, 2023-05-08 at 14:59 -0700, Jeff Davis wrote:
> The easiest thing to do is revert it for now, and after we sort out
> the
> memcmp() path for the ICU provider, then I can commit it again (after
> that point it would just be code cleanup and should have no
> functional
> impact).

The conversion won't be entirely dead code even after we handle the "C"
locale with memcmp(): for a locale like "C.UTF-8", it will still be
passed to the collation provider (same as with libc), and in that case,
we should still convert that to a language tag consistently across ICU
versions.

For it to be entirely dead code, we would need to convert any locale
with language "C" (e.g. "C.UTF-8") to use the memcmp() path. I'm fine
with that, but that's not what the libc provider does today, and
perhaps we should be consistent between the two. If we do leave the
code in place, we can document that specific "en-US-u-va-posix" locale
so that it's not too surprising for users.

Regards,
	Jeff Davis

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

  1. Introduce "builtin" collation provider.

  2. ICU: do not convert locale 'C' to 'en-US-u-va-posix'.

  3. initdb: change default --locale-provider back to libc.

  4. CREATE DATABASE: make LOCALE apply to all collation providers.

  5. Remove read-only server settings lc_collate and lc_ctype

  6. ICU: use uloc_getDefault() for initdb.

  7. Doc fixes for commit 1e16af8ab5.

  8. Doc: fix some rendering problems in the PDF docs build.

  9. Doc improvements for language tags and custom ICU collations.

  10. ICU: check for U_STRING_NOT_TERMINATED_WARNING.

  11. Reduce icu_validation_level default to WARNING.

  12. Revert "ICU: do not convert locale 'C' to 'en-US-u-va-posix'."

  13. Fix initdb --no-locale.

  14. Avoid character classification in regex escape parsing.