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Introduce "builtin" collation provider.

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New provider for collations, like "libc" or "icu", but without any
external dependency.

Initially, the only locale supported by the builtin provider is "C",
which is identical to the libc provider's "C" locale. The libc
provider's "C" locale has always been treated as a special case that
uses an internal implementation, without using libc at all -- so the
new builtin provider uses the same implementation.

The builtin provider's locale is independent of the server environment
variables LC_COLLATE and LC_CTYPE. Using the builtin provider, the
database collation locale can be "C" while LC_COLLATE and LC_CTYPE are
set to "en_US", which is impossible with the libc provider.

By offering a new builtin provider, it clarifies that the semantics of
a collation using this provider will never depend on libc, and makes
it easier to document the behavior.

Discussion: https://postgr.es/m/ab925f69-5f9d-f85e-b87c-bd2a44798659@joeconway.com
Discussion: https://postgr.es/m/dd9261f4-7a98-4565-93ec-336c1c110d90@manitou-mail.org
Discussion: https://postgr.es/m/ff4c2f2f9c8fc7ca27c1c24ae37ecaeaeaff6b53.camel%40j-davis.com
Reviewed-by: Daniel Vérité, Peter Eisentraut, Jeremy Schneider
This commit is contained in:
Jeff Davis
2024-03-13 23:33:44 -07:00
parent 6ab2e8385d
commit 2d819a08a1
25 changed files with 671 additions and 158 deletions
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7
doc/src/sgml/ref/create_database.sgml
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@@ -162,6 +162,11 @@ CREATE DATABASE <replaceable class="parameter">name</replaceable>
linkend="create-database-lc-ctype"/>, or <xref
linkend="create-database-icu-locale"/> individually.
</para>
<para>
If <xref linkend="create-database-locale-provider"/> is
<literal>builtin</literal>, then <replaceable>locale</replaceable>
must be specified and set to <literal>C</literal>.
</para>
<tip>
<para>
The other locale settings <xref linkend="guc-lc-messages"/>, <xref
@@ -243,7 +248,7 @@ CREATE DATABASE <replaceable class="parameter">name</replaceable>
<listitem>
<para>
Specifies the provider to use for the default collation in this
database. Possible values are
database. Possible values are <literal>builtin</literal>,
<literal>icu</literal><indexterm><primary>ICU</primary></indexterm>
(if the server was built with ICU support) or <literal>libc</literal>.
By default, the provider is the same as that of the <xref