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Allow tailoring of ICU locales with custom rules

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This exposes the ICU facility to add custom collation rules to a
standard collation.

New options are added to CREATE COLLATION, CREATE DATABASE, createdb,
and initdb to set the rules.

Reviewed-by: Laurenz Albe <laurenz.albe@cybertec.at>
Reviewed-by: Daniel Verite <daniel@manitou-mail.org>
Discussion: https://www.postgresql.org/message-id/flat/821c71a4-6ef0-d366-9acf-bb8e367f739f@enterprisedb.com
This commit is contained in:
Peter Eisentraut
2023-03-08 16:35:42 +01:00
parent b1534ed99d
commit 30a53b7929
22 changed files with 380 additions and 59 deletions
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14
doc/src/sgml/ref/create_database.sgml
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@@ -30,6 +30,7 @@ CREATE DATABASE <replaceable class="parameter">name</replaceable>
[ LC_COLLATE [=] <replaceable class="parameter">lc_collate</replaceable> ]
[ LC_CTYPE [=] <replaceable class="parameter">lc_ctype</replaceable> ]
[ ICU_LOCALE [=] <replaceable class="parameter">icu_locale</replaceable> ]
[ ICU_RULES [=] <replaceable class="parameter">icu_rules</replaceable> ]
[ LOCALE_PROVIDER [=] <replaceable class="parameter">locale_provider</replaceable> ]
[ COLLATION_VERSION = <replaceable>collation_version</replaceable> ]
[ TABLESPACE [=] <replaceable class="parameter">tablespace_name</replaceable> ]
@@ -192,6 +193,19 @@ CREATE DATABASE <replaceable class="parameter">name</replaceable>
</listitem>
</varlistentry>
<varlistentry id="create-database-icu-rules">
<term><replaceable class="parameter">icu_rules</replaceable></term>
<listitem>
<para>
Specifies additional collation rules to customize the behavior of the
default collation of this database. This is supported for ICU only.
See <ulink
url="https://unicode-org.github.io/icu/userguide/collation/customization/"/>
for details on the syntax.
</para>
</listitem>
</varlistentry>
<varlistentry id="create-database-locale-provider">
<term><replaceable>locale_provider</replaceable></term>