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peterepetere
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Implement the collation columns of various information schema views
Fill in the collation columns of the views attributes, columns, domains, and element_types. Also update collation information in sql_implementation_info.
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-54
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‎doc/src/sgml/information_schema.sgml

Lines changed: 93 additions & 15 deletions
Original file line numberDiff line numberDiff line change
@@ -379,6 +379,53 @@
379379
</entry>
380380
</row>
381381

382+
<row>
383+
<entry><literal>character_set_catalog</literal></entry>
384+
<entry><type>sql_identifier</type></entry>
385+
<entry>Applies to a feature not available in <productname>PostgreSQL</></entry>
386+
</row>
387+
388+
<row>
389+
<entry><literal>character_set_schema</literal></entry>
390+
<entry><type>sql_identifier</type></entry>
391+
<entry>Applies to a feature not available in <productname>PostgreSQL</></entry>
392+
</row>
393+
394+
<row>
395+
<entry><literal>character_set_name</literal></entry>
396+
<entry><type>sql_identifier</type></entry>
397+
<entry>Applies to a feature not available in <productname>PostgreSQL</></entry>
398+
</row>
399+
400+
<row>
401+
<entry><literal>collation_catalog</literal></entry>
402+
<entry><type>sql_identifier</type></entry>
403+
<entry>
404+
Name of the database containing the collation of the attribute
405+
(always the current database), null if default or the data type
406+
of the attribute is not collatable
407+
</entry>
408+
</row>
409+
410+
<row>
411+
<entry><literal>collation_schema</literal></entry>
412+
<entry><type>sql_identifier</type></entry>
413+
<entry>
414+
Name of the schema containing the collation of the attribute,
415+
null if default or the data type of the attribute is not
416+
collatable
417+
</entry>
418+
</row>
419+
420+
<row>
421+
<entry><literal>collation_name</literal></entry>
422+
<entry><type>sql_identifier</type></entry>
423+
<entry>
424+
Name of the collation of the attribute, null if default or the
425+
data type of the attribute is not collatable
426+
</entry>
427+
</row>
428+
382429
<row>
383430
<entry><literal>numeric_precision</literal></entry>
384431
<entry><type>cardinal_number</type></entry>
@@ -1321,19 +1368,29 @@
13211368
<row>
13221369
<entry><literal>collation_catalog</literal></entry>
13231370
<entry><type>sql_identifier</type></entry>
1324-
<entry>Applies to a feature not available in <productname>PostgreSQL</></entry>
1371+
<entry>
1372+
Name of the database containing the collation of the column
1373+
(always the current database), null if default or the data type
1374+
of the column is not collatable
1375+
</entry>
13251376
</row>
13261377

13271378
<row>
13281379
<entry><literal>collation_schema</literal></entry>
13291380
<entry><type>sql_identifier</type></entry>
1330-
<entry>Applies to a feature not available in <productname>PostgreSQL</></entry>
1381+
<entry>
1382+
Name of the schema containing the collation of the column, null
1383+
if default or the data type of the column is not collatable
1384+
</entry>
13311385
</row>
13321386

13331387
<row>
13341388
<entry><literal>collation_name</literal></entry>
13351389
<entry><type>sql_identifier</type></entry>
1336-
<entry>Applies to a feature not available in <productname>PostgreSQL</></entry>
1390+
<entry>
1391+
Name of the collation of the column, null if default or the
1392+
data type of the column is not collatable
1393+
</entry>
13371394
</row>
13381395

13391396
<row>
@@ -1996,19 +2053,29 @@
19962053
<row>
19972054
<entry><literal>collation_catalog</literal></entry>
19982055
<entry><type>sql_identifier</type></entry>
1999-
<entry>Applies to a feature not available in <productname>PostgreSQL</></entry>
2056+
<entry>
2057+
Name of the database containing the collation of the domain
2058+
(always the current database), null if default or the data type
2059+
of the domain is not collatable
2060+
</entry>
20002061
</row>
20012062

20022063
<row>
20032064
<entry><literal>collation_schema</literal></entry>
20042065
<entry><type>sql_identifier</type></entry>
2005-
<entry>Applies to a feature not available in <productname>PostgreSQL</></entry>
2066+
<entry>
2067+
Name of the schema containing the collation of the domain, null
2068+
if default or the data type of the domain is not collatable
2069+
</entry>
20062070
</row>
20072071

20082072
<row>
20092073
<entry><literal>collation_name</literal></entry>
20102074
<entry><type>sql_identifier</type></entry>
2011-
<entry>Applies to a feature not available in <productname>PostgreSQL</></entry>
2075+
<entry>
2076+
Name of the collation of the column, null if default or the
2077+
data type of the domain is not collatable
2078+
</entry>
20122079
</row>
20132080

20142081
<row>
@@ -2275,19 +2342,30 @@ ORDER BY c.ordinal_position;
22752342
<row>
22762343
<entry><literal>collation_catalog</literal></entry>
22772344
<entry><type>sql_identifier</type></entry>
2278-
<entry>Applies to a feature not available in <productname>PostgreSQL</></entry>
2345+
<entry>
2346+
Name of the database containing the collation of the element
2347+
type (always the current database), null if default or the data
2348+
type of the element is not collatable
2349+
</entry>
22792350
</row>
22802351

22812352
<row>
22822353
<entry><literal>collation_schema</literal></entry>
22832354
<entry><type>sql_identifier</type></entry>
2284-
<entry>Applies to a feature not available in <productname>PostgreSQL</></entry>
2355+
<entry>
2356+
Name of the schema containing the collation of the element
2357+
type, null if default or the data type of the element is not
2358+
collatable
2359+
</entry>
22852360
</row>
22862361

22872362
<row>
22882363
<entry><literal>collation_name</literal></entry>
22892364
<entry><type>sql_identifier</type></entry>
2290-
<entry>Applies to a feature not available in <productname>PostgreSQL</></entry>
2365+
<entry>
2366+
Name of the collation of the element type, null if default or
2367+
the data type of the element is not collatable
2368+
</entry>
22912369
</row>
22922370

22932371
<row>
@@ -3025,19 +3103,19 @@ ORDER BY c.ordinal_position;
30253103
<row>
30263104
<entry><literal>collation_catalog</literal></entry>
30273105
<entry><type>sql_identifier</type></entry>
3028-
<entry>Applies to a feature not available in <productname>PostgreSQL</></entry>
3106+
<entry>Always null, since this information is not applied to parameter data types in <productname>PostgreSQL</></entry>
30293107
</row>
30303108

30313109
<row>
30323110
<entry><literal>collation_schema</literal></entry>
30333111
<entry><type>sql_identifier</type></entry>
3034-
<entry>Applies to a feature not available in <productname>PostgreSQL</></entry>
3112+
<entry>Always null, since this information is not applied to parameter data types in <productname>PostgreSQL</></entry>
30353113
</row>
30363114

30373115
<row>
30383116
<entry><literal>collation_name</literal></entry>
30393117
<entry><type>sql_identifier</type></entry>
3040-
<entry>Applies to a feature not available in <productname>PostgreSQL</></entry>
3118+
<entry>Always null, since this information is not applied to parameter data types in <productname>PostgreSQL</></entry>
30413119
</row>
30423120

30433121
<row>
@@ -3912,19 +3990,19 @@ ORDER BY c.ordinal_position;
39123990
<row>
39133991
<entry><literal>collation_catalog</literal></entry>
39143992
<entry><type>sql_identifier</type></entry>
3915-
<entry>Applies to a feature not available in <productname>PostgreSQL</></entry>
3993+
<entry>Always null, since this information is not applied to return data types in <productname>PostgreSQL</></entry>
39163994
</row>
39173995

39183996
<row>
39193997
<entry><literal>collation_schema</literal></entry>
39203998
<entry><type>sql_identifier</type></entry>
3921-
<entry>Applies to a feature not available in <productname>PostgreSQL</></entry>
3999+
<entry>Always null, since this information is not applied to return data types in <productname>PostgreSQL</></entry>
39224000
</row>
39234001

39244002
<row>
39254003
<entry><literal>collation_name</literal></entry>
39264004
<entry><type>sql_identifier</type></entry>
3927-
<entry>Applies to a feature not available in <productname>PostgreSQL</></entry>
4005+
<entry>Always null, since this information is not applied to return data types in <productname>PostgreSQL</></entry>
39284006
</row>
39294007

39304008
<row>

‎src/backend/catalog/information_schema.sql

Lines changed: 39 additions & 39 deletions
Original file line numberDiff line numberDiff line change
@@ -297,9 +297,9 @@ CREATE VIEW attributes AS
297297
CAST(null AS sql_identifier) AS character_set_schema,
298298
CAST(null AS sql_identifier) AS character_set_name,
299299

300-
CAST(null AS sql_identifier) AS collation_catalog,
301-
CAST(null AS sql_identifier) AS collation_schema,
302-
CAST(null AS sql_identifier) AS collation_name,
300+
CAST(CASE WHEN nco.nspname IS NOT NULL THEN current_database() END AS sql_identifier) AS collation_catalog,
301+
CAST(nco.nspname AS sql_identifier) AS collation_schema,
302+
CAST(co.collname AS sql_identifier) AS collation_name,
303303

304304
CAST(
305305
_pg_numeric_precision(_pg_truetypid(a, t), _pg_truetypmod(a, t))
@@ -336,14 +336,13 @@ CREATE VIEW attributes AS
336336
CAST(a.attnum AS sql_identifier) AS dtd_identifier,
337337
CAST('NO' AS yes_or_no) AS is_derived_reference_attribute
338338

339-
FROM (pg_attribute a LEFT JOIN pg_attrdef ad ON attrelid = adrelid AND attnum = adnum),
340-
pg_class c, pg_namespace nc,
341-
(pg_type t JOIN pg_namespace nt ON (t.typnamespace = nt.oid))
339+
FROM (pg_attribute a LEFT JOIN pg_attrdef ad ON attrelid = adrelid AND attnum = adnum)
340+
JOIN (pg_class c JOIN pg_namespace nc ON (c.relnamespace = nc.oid)) ON a.attrelid = c.oid
341+
JOIN (pg_type t JOIN pg_namespace nt ON (t.typnamespace = nt.oid)) ON a.atttypid = t.oid
342+
LEFT JOIN (pg_collation co JOIN pg_namespace nco ON (co.collnamespace = nco.oid))
343+
ON a.attcollation = co.oid AND (nco.nspname, co.collname) <> ('pg_catalog', 'default')
342344

343-
WHERE a.attrelid = c.oid
344-
AND a.atttypid = t.oid
345-
AND nc.oid = c.relnamespace
346-
AND a.attnum > 0 AND NOT a.attisdropped
345+
WHERE a.attnum > 0 AND NOT a.attisdropped
347346
AND c.relkind in ('c');
348347

349348
GRANT SELECT ON attributes TO PUBLIC;
@@ -678,9 +677,9 @@ CREATE VIEW columns AS
678677
CAST(null AS sql_identifier) AS character_set_schema,
679678
CAST(null AS sql_identifier) AS character_set_name,
680679

681-
CAST(null AS sql_identifier) AS collation_catalog,
682-
CAST(null AS sql_identifier) AS collation_schema,
683-
CAST(null AS sql_identifier) AS collation_name,
680+
CAST(CASE WHEN nco.nspname IS NOT NULL THEN current_database() END AS sql_identifier) AS collation_catalog,
681+
CAST(nco.nspname AS sql_identifier) AS collation_schema,
682+
CAST(co.collname AS sql_identifier) AS collation_name,
684683

685684
CAST(CASE WHEN t.typtype = 'd' THEN current_database() ELSE null END
686685
AS sql_identifier) AS domain_catalog,
@@ -718,16 +717,15 @@ CREATE VIEW columns AS
718717
AND EXISTS (SELECT 1 FROM pg_rewrite WHERE ev_class = c.oid AND ev_type = '4' AND is_instead))
719718
THEN 'YES' ELSE 'NO' END AS yes_or_no) AS is_updatable
720719

721-
FROM (pg_attribute a LEFT JOIN pg_attrdef ad ON attrelid = adrelid AND attnum = adnum),
722-
pg_class c, pg_namespace nc,
723-
(pg_type t JOIN pg_namespace nt ON (t.typnamespace = nt.oid))
724-
LEFT JOIN (pg_type bt JOIN pg_namespace nbt ON (bt.typnamespace = nbt.oid))
720+
FROM (pg_attribute a LEFT JOIN pg_attrdef ad ON attrelid = adrelid AND attnum = adnum)
721+
JOIN (pg_class c JOIN pg_namespace nc ON (c.relnamespace = nc.oid)) ON a.attrelid = c.oid
722+
JOIN (pg_type t JOIN pg_namespace nt ON (t.typnamespace = nt.oid)) ON a.atttypid = t.oid
723+
LEFT JOIN (pg_type bt JOIN pg_namespace nbt ON (bt.typnamespace = nbt.oid))
725724
ON (t.typtype = 'd' AND t.typbasetype = bt.oid)
725+
LEFT JOIN (pg_collation co JOIN pg_namespace nco ON (co.collnamespace = nco.oid))
726+
ON a.attcollation = co.oid AND (nco.nspname, co.collname) <> ('pg_catalog', 'default')
726727

727-
WHERE a.attrelid = c.oid
728-
AND a.atttypid = t.oid
729-
AND nc.oid = c.relnamespace
730-
AND (NOT pg_is_other_temp_schema(nc.oid))
728+
WHERE (NOT pg_is_other_temp_schema(nc.oid))
731729

732730
AND a.attnum > 0 AND NOT a.attisdropped AND c.relkind in ('r', 'v', 'f')
733731

@@ -914,9 +912,9 @@ CREATE VIEW domains AS
914912
CAST(null AS sql_identifier) AS character_set_schema,
915913
CAST(null AS sql_identifier) AS character_set_name,
916914

917-
CAST(null AS sql_identifier) AS collation_catalog,
918-
CAST(null AS sql_identifier) AS collation_schema,
919-
CAST(null AS sql_identifier) AS collation_name,
915+
CAST(CASE WHEN nco.nspname IS NOT NULL THEN current_database() END AS sql_identifier) AS collation_catalog,
916+
CAST(nco.nspname AS sql_identifier) AS collation_schema,
917+
CAST(co.collname AS sql_identifier) AS collation_name,
920918

921919
CAST(
922920
_pg_numeric_precision(t.typbasetype, t.typtypmod)
@@ -954,13 +952,13 @@ CREATE VIEW domains AS
954952
CAST(null AS cardinal_number) AS maximum_cardinality,
955953
CAST(1 AS sql_identifier) AS dtd_identifier
956954

957-
FROM pg_type t, pg_namespace nt,
958-
pg_type bt, pg_namespace nbt
955+
FROM (pg_type t JOIN pg_namespace nt ON t.typnamespace = nt.oid)
956+
JOIN (pg_type bt JOIN pg_namespace nbt ON bt.typnamespace = nbt.oid)
957+
ON (t.typbasetype = bt.oid AND t.typtype = 'd')
958+
LEFT JOIN (pg_collation co JOIN pg_namespace nco ON (co.collnamespace = nco.oid))
959+
ON t.typcollation = co.oid AND (nco.nspname, co.collname) <> ('pg_catalog', 'default')
959960

960-
WHERE t.typnamespace = nt.oid
961-
AND t.typbasetype = bt.oid
962-
AND bt.typnamespace = nbt.oid
963-
AND t.typtype = 'd';
961+
;
964962

965963
GRANT SELECT ON domains TO PUBLIC;
966964

@@ -1515,7 +1513,7 @@ CREATE TABLE sql_implementation_info (
15151513
) WITHOUT OIDS;
15161514

15171515
INSERT INTO sql_implementation_info VALUES ('10003', 'CATALOG NAME', NULL, 'Y', NULL);
1518-
INSERT INTO sql_implementation_info VALUES ('10004', 'COLLATING SEQUENCE', NULL, '', 'not supported');
1516+
INSERT INTO sql_implementation_info VALUES ('10004', 'COLLATING SEQUENCE', NULL, (SELECT default_collate_name FROM character_sets), NULL);
15191517
INSERT INTO sql_implementation_info VALUES ('23', 'CURSOR COMMIT BEHAVIOR', 1, NULL, 'close cursors and retain prepared statements');
15201518
INSERT INTO sql_implementation_info VALUES ('2', 'DATA SOURCE NAME', NULL, '', NULL);
15211519
INSERT INTO sql_implementation_info VALUES ('17', 'DBMS NAME', NULL, (select trim(trailing ' ' from substring(version() from '^[^0-9]*'))), NULL);
@@ -2442,9 +2440,9 @@ CREATE VIEW element_types AS
24422440
CAST(null AS sql_identifier) AS character_set_catalog,
24432441
CAST(null AS sql_identifier) AS character_set_schema,
24442442
CAST(null AS sql_identifier) AS character_set_name,
2445-
CAST(null AS sql_identifier) AS collation_catalog,
2446-
CAST(null AS sql_identifier) AS collation_schema,
2447-
CAST(null AS sql_identifier) AS collation_name,
2443+
CAST(CASE WHEN nco.nspname IS NOT NULL THEN current_database() END AS sql_identifier) AS collation_catalog,
2444+
CAST(nco.nspname AS sql_identifier) AS collation_schema,
2445+
CAST(co.collname AS sql_identifier) AS collation_name,
24482446
CAST(null AS cardinal_number) AS numeric_precision,
24492447
CAST(null AS cardinal_number) AS numeric_precision_radix,
24502448
CAST(null AS cardinal_number) AS numeric_scale,
@@ -2470,7 +2468,7 @@ CREATE VIEW element_types AS
24702468
/* columns, attributes */
24712469
SELECT c.relnamespace, CAST(c.relname AS sql_identifier),
24722470
CASE WHEN c.relkind = 'c' THEN 'USER-DEFINED TYPE'::text ELSE 'TABLE'::text END,
2473-
a.attnum, a.atttypid
2471+
a.attnum, a.atttypid, a.attcollation
24742472
FROM pg_class c, pg_attribute a
24752473
WHERE c.oid = a.attrelid
24762474
AND c.relkind IN ('r', 'v', 'f', 'c')
@@ -2480,15 +2478,15 @@ CREATE VIEW element_types AS
24802478

24812479
/* domains */
24822480
SELECT t.typnamespace, CAST(t.typname AS sql_identifier),
2483-
'DOMAIN'::text, 1, t.typbasetype
2481+
'DOMAIN'::text, 1, t.typbasetype, t.typcollation
24842482
FROM pg_type t
24852483
WHERE t.typtype = 'd'
24862484

24872485
UNION ALL
24882486

24892487
/* parameters */
24902488
SELECT pronamespace, CAST(proname || '_' || CAST(oid AS text) AS sql_identifier),
2491-
'ROUTINE'::text, (ss.x).n, (ss.x).x
2489+
'ROUTINE'::text, (ss.x).n, (ss.x).x, 0
24922490
FROM (SELECT p.pronamespace, p.proname, p.oid,
24932491
_pg_expandarray(coalesce(p.proallargtypes, p.proargtypes::oid[])) AS x
24942492
FROM pg_proc p) AS ss
@@ -2497,10 +2495,12 @@ CREATE VIEW element_types AS
24972495

24982496
/* result types */
24992497
SELECT p.pronamespace, CAST(p.proname || '_' || CAST(p.oid AS text) AS sql_identifier),
2500-
'ROUTINE'::text, 0, p.prorettype
2498+
'ROUTINE'::text, 0, p.prorettype, 0
25012499
FROM pg_proc p
25022500

2503-
) AS x (objschema, objname, objtype, objdtdid, objtypeid)
2501+
) AS x (objschema, objname, objtype, objdtdid, objtypeid, objcollation)
2502+
LEFT JOIN (pg_collation co JOIN pg_namespace nco ON (co.collnamespace = nco.oid))
2503+
ON x.objcollation = co.oid AND (nco.nspname, co.collname) <> ('pg_catalog', 'default')
25042504

25052505
WHERE n.oid = x.objschema
25062506
AND at.oid = x.objtypeid

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