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Enable pg_collation_actual_version() to work on the default collation.

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Previously, it would simply return NULL, which was less useful.

Discussion: https://postgr.es/m/51fb77507cafd43fc1a2e733c23045873d93ae60.camel%40j-davis.com
Reviewed-by: Thomas Munro
This commit is contained in:
Jeff Davis 2022-10-29 13:30:15 -07:00
parent 6e10631d1e
commit 10932ed5e5
1 changed files with 49 additions and 20 deletions
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69
src/backend/commands/collationcmds.c
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@ -22,6 +22,7 @@
#include "catalog/namespace.h"
#include "catalog/objectaccess.h"
#include "catalog/pg_collation.h"
#include "catalog/pg_database.h"
#include "commands/alter.h"
#include "commands/collationcmds.h"
#include "commands/comment.h"
@ -425,33 +426,61 @@ AlterCollation(AlterCollationStmt *stmt)
Datum
pg_collation_actual_version(PG_FUNCTION_ARGS)
{
Oid collid = PG_GETARG_OID(0);
HeapTuple tp;
char collprovider;
Datum datum;
bool isnull;
char *version;
Oid collid = PG_GETARG_OID(0);
char provider;
char *locale;
char *version;
Datum datum;
bool isnull;
tp = SearchSysCache1(COLLOID, ObjectIdGetDatum(collid));
if (!HeapTupleIsValid(tp))
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("collation with OID %u does not exist", collid)));
collprovider = ((Form_pg_collation) GETSTRUCT(tp))->collprovider;
if (collprovider != COLLPROVIDER_DEFAULT)
if (collid == DEFAULT_COLLATION_OID)
{
datum = SysCacheGetAttr(COLLOID, tp, collprovider == COLLPROVIDER_ICU ? Anum_pg_collation_colliculocale : Anum_pg_collation_collcollate, &isnull);
/* retrieve from pg_database */
HeapTuple dbtup = SearchSysCache1(DATABASEOID, ObjectIdGetDatum(MyDatabaseId));
if (!HeapTupleIsValid(dbtup))
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("database with OID %u does not exist", MyDatabaseId)));
provider = ((Form_pg_database) GETSTRUCT(dbtup))->datlocprovider;
datum = SysCacheGetAttr(DATABASEOID, dbtup,
provider == COLLPROVIDER_ICU ?
Anum_pg_database_daticulocale : Anum_pg_database_datcollate,
&isnull);
if (isnull)
elog(ERROR, "unexpected null in pg_collation");
version = get_collation_actual_version(collprovider, TextDatumGetCString(datum));
elog(ERROR, "unexpected null in pg_database");
locale = TextDatumGetCString(datum);
ReleaseSysCache(dbtup);
}
else
version = NULL;
{
/* retrieve from pg_collation */
ReleaseSysCache(tp);
HeapTuple colltp = SearchSysCache1(COLLOID, ObjectIdGetDatum(collid));
if (!HeapTupleIsValid(colltp))
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("collation with OID %u does not exist", collid)));
provider = ((Form_pg_collation) GETSTRUCT(colltp))->collprovider;
Assert(provider != COLLPROVIDER_DEFAULT);
datum = SysCacheGetAttr(COLLOID, colltp,
provider == COLLPROVIDER_ICU ?
Anum_pg_collation_colliculocale : Anum_pg_collation_collcollate,
&isnull);
if (isnull)
elog(ERROR, "unexpected null in pg_collation");
locale = TextDatumGetCString(datum);
ReleaseSysCache(colltp);
}
version = get_collation_actual_version(provider, locale);
if (version)
PG_RETURN_TEXT_P(cstring_to_text(version));
else