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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: "Jonathan S. Katz" <jkatz@postgresql.org>, Robert Haas <robertmhaas@gmail.com>
Cc: Tom Lane <tgl@sss.pgh.pa.us>, Regina Obe <lr@pcorp.us>, Peter Eisentraut <peter.eisentraut@enterprisedb.com>, Sandro Santilli <strk@kbt.io>, pgsql-hackers@lists.postgresql.org
Date: 2023-05-18T17:55:49Z
Lists: pgsql-hackers 
On Wed, 2023-05-17 at 19:59 -0400, Jonathan S. Katz wrote:
> I did a quicker read through this time. LGTM overall. I like what you
> did with the explanations around sensitivity (now it makes sense).

Committed, thank you.

There are a few things I don't understand that would be good to
document better:

* Rules. I still don't quite understand the use case: are these for
people inventing new languages? What is a plausible use case that isn't
covered by the existing locales and collation settings? Do rules make
sense for a database default collation? Are they for language experts
only or might an ordinary developer benefit from using them?

* The collation types "phonebk", "emoji", etc.: are these variants of
particular locales, or do they make sense in multiple locales? I don't
know where they fit in or how to document them.

* I don't understand what "kc" means if "ks" is not set to "level1".

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.