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Additional unicode primitive functions.

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Introduce unicode_version(), icu_unicode_version(), and
unicode_assigned().

The latter requires introducing a new lookup table for the Unicode
General Category, which is generated along with the other Unicode
lookup tables.

Discussion: https://postgr.es/m/CA+TgmoYzYR-yhU6k1XFCADeyj=Oyz2PkVsa3iKv+keM8wp-F_A@mail.gmail.com
Reviewed-by: Peter Eisentraut
This commit is contained in:
Jeff Davis
2023-11-01 22:47:06 -07:00
parent 7021d3b176
commit a02b37fc08
18 changed files with 4924 additions and 22 deletions
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109
doc/src/sgml/func.sgml
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@ -2859,6 +2859,22 @@ repeat('Pg', 4) <returnvalue>PgPgPgPg</returnvalue>
</para></entry>
</row>
<row>
<entry role="func_table_entry"><para role="func_signature">
<indexterm>
<primary>unicode_assigned</primary>
</indexterm>
<function>unicode_assigned</function> ( <type>text</type> )
<returnvalue>text</returnvalue>
</para>
<para>
Returns <literal>true</literal> if all characters in the string are
assigned Unicode codepoints; <literal>false</literal> otherwise. This
function can only be used when the server encoding is
<literal>UTF8</literal>.
</para></entry>
</row>
<row>
<entry role="func_table_entry"><para role="func_signature">
<indexterm>
@ -23427,25 +23443,6 @@ SELECT * FROM pg_ls_dir('.') WITH ORDINALITY AS t(ls,n);
This is equivalent to <function>current_user</function>.
</para></entry>
</row>
<row>
<entry role="func_table_entry"><para role="func_signature">
<indexterm>
<primary>version</primary>
</indexterm>
<function>version</function> ()
<returnvalue>text</returnvalue>
</para>
<para>
Returns a string describing the <productname>PostgreSQL</productname>
server's version. You can also get this information from
<xref linkend="guc-server-version"/>, or for a machine-readable
version use <xref linkend="guc-server-version-num"/>. Software
developers should use <varname>server_version_num</varname> (available
since 8.2) or <xref linkend="libpq-PQserverVersion"/> instead of
parsing the text version.
</para></entry>
</row>
</tbody>
</tgroup>
</table>
@ -26332,6 +26329,80 @@ SELECT collation for ('foo' COLLATE "de_DE");
</sect2>
<sect2 id="functions-info-version">
<title>Version Information Functions</title>
<para>
The functions shown in <xref linkend="functions-version"/>
print version information.
</para>
<table id="functions-version">
<title>Version Information Functions</title>
<tgroup cols="1">
<thead>
<row>
<entry role="func_table_entry"><para role="func_signature">
Function
</para>
<para>
Description
</para></entry>
</row>
</thead>
<tbody>
<row>
<entry role="func_table_entry"><para role="func_signature">
<indexterm>
<primary>version</primary>
</indexterm>
<function>version</function> ()
<returnvalue>text</returnvalue>
</para>
<para>
Returns a string describing the <productname>PostgreSQL</productname>
server's version. You can also get this information from
<xref linkend="guc-server-version"/>, or for a machine-readable
version use <xref linkend="guc-server-version-num"/>. Software
developers should use <varname>server_version_num</varname> (available
since 8.2) or <xref linkend="libpq-PQserverVersion"/> instead of
parsing the text version.
</para></entry>
</row>
<row>
<entry role="func_table_entry"><para role="func_signature">
<indexterm>
<primary>unicode_version</primary>
</indexterm>
<function>unicode_version</function> ()
<returnvalue>text</returnvalue>
</para>
<para>
Returns a string representing the version of Unicode used by
<productname>PostgreSQL</productname>.
</para></entry>
</row>
<row>
<entry role="func_table_entry"><para role="func_signature">
<indexterm>
<primary>icu_unicode_version</primary>
</indexterm>
<function>icu_unicode_version</function> ()
<returnvalue>text</returnvalue>
</para>
<para>
Returns a string representing the version of Unicode used by ICU, if
the server was built with ICU support; otherwise returns
<literal>NULL</literal> </para></entry>
</row>
</tbody>
</tgroup>
</table>
</sect2>
</sect1>
<sect1 id="functions-admin">