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Commit30a53b7

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Allow tailoring of ICU locales with custom rules
This exposes the ICU facility to add custom collation rules to astandard 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
1 parentb1534ed commit30a53b7

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22 files changed

+380
-59
lines changed

22 files changed

+380
-59
lines changed

‎doc/src/sgml/catalogs.sgml

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Original file line numberDiff line numberDiff line change
@@ -2428,6 +2428,15 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
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</para></entry>
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</row>
24302430

2431+
<row>
2432+
<entry role="catalog_table_entry"><para role="column_definition">
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<structfield>collicurules</structfield> <type>text</type>
2434+
</para>
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<para>
2436+
ICU collation rules for this collation object
2437+
</para></entry>
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</row>
2439+
24312440
<row>
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<entry role="catalog_table_entry"><para role="column_definition">
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<structfield>collversion</structfield> <type>text</type>
@@ -3106,6 +3115,15 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
31063115
</para></entry>
31073116
</row>
31083117

3118+
<row>
3119+
<entry role="catalog_table_entry"><para role="column_definition">
3120+
<structfield>daticurules</structfield> <type>text</type>
3121+
</para>
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<para>
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ICU collation rules for this database
3124+
</para></entry>
3125+
</row>
3126+
31093127
<row>
31103128
<entry role="catalog_table_entry"><para role="column_definition">
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<structfield>datcollversion</structfield> <type>text</type>

‎doc/src/sgml/ref/create_collation.sgml

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Original file line numberDiff line numberDiff line change
@@ -27,6 +27,7 @@ CREATE COLLATION [ IF NOT EXISTS ] <replaceable>name</replaceable> (
2727
[ LC_CTYPE = <replaceable>lc_ctype</replaceable>, ]
2828
[ PROVIDER = <replaceable>provider</replaceable>, ]
2929
[ DETERMINISTIC = <replaceable>boolean</replaceable>, ]
30+
[ RULES = <replaceable>rules</replaceable>, ]
3031
[ VERSION = <replaceable>version</replaceable> ]
3132
)
3233
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
149150
</listitem>
150151
</varlistentry>
151152

153+
<varlistentry>
154+
<term><replaceable>rules</replaceable></term>
155+
156+
<listitem>
157+
<para>
158+
Specifies additional collation rules to customize the behavior of the
159+
collation. This is supported for ICU only. See <ulink
160+
url="https://unicode-org.github.io/icu/userguide/collation/customization/"/>
161+
for details on the syntax.
162+
</para>
163+
</listitem>
164+
</varlistentry>
165+
152166
<varlistentry>
153167
<term><replaceable>version</replaceable></term>
154168

@@ -228,6 +242,14 @@ CREATE COLLATION german_phonebook (provider = icu, locale = 'de-u-co-phonebk');
228242
</programlisting>
229243
</para>
230244

245+
<para>
246+
To create a collation using the ICU provider, based on the English ICU
247+
locale, with custom rules:
248+
<programlisting>
249+
<![CDATA[CREATE COLLATION en_custom (provider = icu, locale = 'en', rules = '&a < g');]]>
250+
</programlisting>
251+
</para>
252+
231253
<para>
232254
To create a collation from an existing collation:
233255
<programlisting>

‎doc/src/sgml/ref/create_database.sgml

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Original file line numberDiff line numberDiff line change
@@ -30,6 +30,7 @@ CREATE DATABASE <replaceable class="parameter">name</replaceable>
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[ LC_COLLATE [=] <replaceable class="parameter">lc_collate</replaceable> ]
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[ LC_CTYPE [=] <replaceable class="parameter">lc_ctype</replaceable> ]
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[ ICU_LOCALE [=] <replaceable class="parameter">icu_locale</replaceable> ]
33+
[ ICU_RULES [=] <replaceable class="parameter">icu_rules</replaceable> ]
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[ LOCALE_PROVIDER [=] <replaceable class="parameter">locale_provider</replaceable> ]
3435
[ COLLATION_VERSION = <replaceable>collation_version</replaceable> ]
3536
[ TABLESPACE [=] <replaceable class="parameter">tablespace_name</replaceable> ]
@@ -192,6 +193,19 @@ CREATE DATABASE <replaceable class="parameter">name</replaceable>
192193
</listitem>
193194
</varlistentry>
194195

196+
<varlistentry id="create-database-icu-rules">
197+
<term><replaceable class="parameter">icu_rules</replaceable></term>
198+
<listitem>
199+
<para>
200+
Specifies additional collation rules to customize the behavior of the
201+
default collation of this database. This is supported for ICU only.
202+
See <ulink
203+
url="https://unicode-org.github.io/icu/userguide/collation/customization/"/>
204+
for details on the syntax.
205+
</para>
206+
</listitem>
207+
</varlistentry>
208+
195209
<varlistentry id="create-database-locale-provider">
196210
<term><replaceable>locale_provider</replaceable></term>
197211

‎doc/src/sgml/ref/createdb.sgml

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Original file line numberDiff line numberDiff line change
@@ -157,6 +157,16 @@ PostgreSQL documentation
157157
</listitem>
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</varlistentry>
159159

160+
<varlistentry>
161+
<term><option>--icu-rules=<replaceable class="parameter">rules</replaceable></option></term>
162+
<listitem>
163+
<para>
164+
Specifies additional collation rules to customize the behavior of the
165+
default collation of this database. This is supported for ICU only.
166+
</para>
167+
</listitem>
168+
</varlistentry>
169+
160170
<varlistentry>
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<term><option>--locale-provider={<literal>libc</literal>|<literal>icu</literal>}</option></term>
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<listitem>

‎doc/src/sgml/ref/initdb.sgml

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@@ -239,6 +239,16 @@ PostgreSQL documentation
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</listitem>
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</varlistentry>
241241

242+
<varlistentry id="app-initdb-icu-rules">
243+
<term><option>--icu-rules=<replaceable>rules</replaceable></option></term>
244+
<listitem>
245+
<para>
246+
Specifies additional collation rules to customize the behavior of the
247+
default collation. This is supported for ICU only.
248+
</para>
249+
</listitem>
250+
</varlistentry>
251+
242252
<varlistentry id="app-initdb-data-checksums" xreflabel="data checksums">
243253
<term><option>-k</option></term>
244254
<term><option>--data-checksums</option></term>

‎src/backend/catalog/pg_collation.c

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Original file line numberDiff line numberDiff line change
@@ -50,6 +50,7 @@ CollationCreate(const char *collname, Oid collnamespace,
5050
int32collencoding,
5151
constchar*collcollate,constchar*collctype,
5252
constchar*colliculocale,
53+
constchar*collicurules,
5354
constchar*collversion,
5455
boolif_not_exists,
5556
boolquiet)
@@ -194,6 +195,10 @@ CollationCreate(const char *collname, Oid collnamespace,
194195
values[Anum_pg_collation_colliculocale-1]=CStringGetTextDatum(colliculocale);
195196
else
196197
nulls[Anum_pg_collation_colliculocale-1]= true;
198+
if (collicurules)
199+
values[Anum_pg_collation_collicurules-1]=CStringGetTextDatum(collicurules);
200+
else
201+
nulls[Anum_pg_collation_collicurules-1]= true;
197202
if (collversion)
198203
values[Anum_pg_collation_collversion-1]=CStringGetTextDatum(collversion);
199204
else

‎src/backend/commands/collationcmds.c

Lines changed: 19 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -64,10 +64,12 @@ DefineCollation(ParseState *pstate, List *names, List *parameters, bool if_not_e
6464
DefElem*lcctypeEl=NULL;
6565
DefElem*providerEl=NULL;
6666
DefElem*deterministicEl=NULL;
67+
DefElem*rulesEl=NULL;
6768
DefElem*versionEl=NULL;
6869
char*collcollate;
6970
char*collctype;
7071
char*colliculocale;
72+
char*collicurules;
7173
boolcollisdeterministic;
7274
intcollencoding;
7375
charcollprovider;
@@ -99,6 +101,8 @@ DefineCollation(ParseState *pstate, List *names, List *parameters, bool if_not_e
99101
defelp=&providerEl;
100102
elseif (strcmp(defel->defname,"deterministic")==0)
101103
defelp=&deterministicEl;
104+
elseif (strcmp(defel->defname,"rules")==0)
105+
defelp=&rulesEl;
102106
elseif (strcmp(defel->defname,"version")==0)
103107
defelp=&versionEl;
104108
else
@@ -161,6 +165,12 @@ DefineCollation(ParseState *pstate, List *names, List *parameters, bool if_not_e
161165
else
162166
colliculocale=NULL;
163167

168+
datum=SysCacheGetAttr(COLLOID,tp,Anum_pg_collation_collicurules,&isnull);
169+
if (!isnull)
170+
collicurules=TextDatumGetCString(datum);
171+
else
172+
collicurules=NULL;
173+
164174
ReleaseSysCache(tp);
165175

166176
/*
@@ -182,6 +192,7 @@ DefineCollation(ParseState *pstate, List *names, List *parameters, bool if_not_e
182192
collcollate=NULL;
183193
collctype=NULL;
184194
colliculocale=NULL;
195+
collicurules=NULL;
185196

186197
if (providerEl)
187198
collproviderstr=defGetString(providerEl);
@@ -191,6 +202,9 @@ DefineCollation(ParseState *pstate, List *names, List *parameters, bool if_not_e
191202
else
192203
collisdeterministic= true;
193204

205+
if (rulesEl)
206+
collicurules=defGetString(rulesEl);
207+
194208
if (versionEl)
195209
collversion=defGetString(versionEl);
196210

@@ -297,6 +311,7 @@ DefineCollation(ParseState *pstate, List *names, List *parameters, bool if_not_e
297311
collcollate,
298312
collctype,
299313
colliculocale,
314+
collicurules,
300315
collversion,
301316
if_not_exists,
302317
false);/* not quiet */
@@ -680,7 +695,7 @@ create_collation_from_locale(const char *locale, int nspid,
680695
*/
681696
collid=CollationCreate(locale,nspid,GetUserId(),
682697
COLLPROVIDER_LIBC, true,enc,
683-
locale,locale,NULL,
698+
locale,locale,NULL,NULL,
684699
get_collation_actual_version(COLLPROVIDER_LIBC,locale),
685700
true, true);
686701
if (OidIsValid(collid))
@@ -755,7 +770,7 @@ win32_read_locale(LPWSTR pStr, DWORD dwFlags, LPARAM lparam)
755770

756771
collid=CollationCreate(alias,param->nspid,GetUserId(),
757772
COLLPROVIDER_LIBC, true,enc,
758-
localebuf,localebuf,NULL,
773+
localebuf,localebuf,NULL,NULL,
759774
get_collation_actual_version(COLLPROVIDER_LIBC,localebuf),
760775
true, true);
761776
if (OidIsValid(collid))
@@ -889,7 +904,7 @@ pg_import_system_collations(PG_FUNCTION_ARGS)
889904

890905
collid=CollationCreate(alias,nspid,GetUserId(),
891906
COLLPROVIDER_LIBC, true,enc,
892-
locale,locale,NULL,
907+
locale,locale,NULL,NULL,
893908
get_collation_actual_version(COLLPROVIDER_LIBC,locale),
894909
true, true);
895910
if (OidIsValid(collid))
@@ -951,7 +966,7 @@ pg_import_system_collations(PG_FUNCTION_ARGS)
951966
collid=CollationCreate(psprintf("%s-x-icu",langtag),
952967
nspid,GetUserId(),
953968
COLLPROVIDER_ICU, true,-1,
954-
NULL,NULL,iculocstr,
969+
NULL,NULL,iculocstr,NULL,
955970
get_collation_actual_version(COLLPROVIDER_ICU,iculocstr),
956971
true, true);
957972
if (OidIsValid(collid))

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