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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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22
doc/src/sgml/ref/create_collation.sgml
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@@ -27,6 +27,7 @@ CREATE COLLATION [ IF NOT EXISTS ] <replaceable>name</replaceable> (
[ LC_CTYPE = <replaceable>lc_ctype</replaceable>, ]
[ PROVIDER = <replaceable>provider</replaceable>, ]
[ DETERMINISTIC = <replaceable>boolean</replaceable>, ]
[ RULES = <replaceable>rules</replaceable>, ]
[ VERSION = <replaceable>version</replaceable> ]
)
CREATE COLLATION [ IF NOT EXISTS ] <replaceable>name</replaceable> FROM <replaceable>existing_collation</replaceable>
@@ -149,6 +150,19 @@ CREATE COLLATION [ IF NOT EXISTS ] <replaceable>name</replaceable> FROM <replace
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable>rules</replaceable></term>
<listitem>
<para>
Specifies additional collation rules to customize the behavior of the
collation. 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>
<term><replaceable>version</replaceable></term>
@@ -228,6 +242,14 @@ CREATE COLLATION german_phonebook (provider = icu, locale = 'de-u-co-phonebk');
</programlisting>
</para>
<para>
To create a collation using the ICU provider, based on the English ICU
locale, with custom rules:
<programlisting>
<![CDATA[CREATE COLLATION en_custom (provider = icu, locale = 'en', rules = '&a < g');]]>
</programlisting>
</para>
<para>
To create a collation from an existing collation:
<programlisting>