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Special case C_COLLATION_OID in pg_newlocale_from_collation().

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Allow pg_newlocale_from_collation(C_COLLATION_OID) to work even if
there's no catalog access, which some extensions expect.

Not known to be a bug without extensions involved, but backport to 18.

Also corrects an issue in master with dummy_c_locale (introduced in
commit 5a38104b36) where deterministic was not set. That wasn't a bug,
but could have been if that structure was used more widely.

Reported-by: Alexander Kukushkin <cyberdemn@gmail.com>
Reviewed-by: Alexander Kukushkin <cyberdemn@gmail.com>
Discussion: https://postgr.es/m/CAFh8B=nj966ECv5vi_u3RYij12v0j-7NPZCXLYzNwOQp9AcPWQ@mail.gmail.com
Backpatch-through: 18
This commit is contained in:
Jeff Davis
2025-11-04 16:28:07 -08:00
parent 8ae0f6a0c3
commit d115de9d89
2 changed files with 18 additions and 31 deletions
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26
src/backend/regex/regc_pg_locale.c
View File

@@ -23,11 +23,6 @@
static pg_locale_t pg_regex_locale;
static struct pg_locale_struct dummy_c_locale = {
.collate_is_c = true,
.ctype_is_c = true,
};
/*
* pg_set_regex_collation: set collation for these functions to obey
@@ -53,17 +48,6 @@ pg_set_regex_collation(Oid collation)
errhint("Use the COLLATE clause to set the collation explicitly.")));
}
if (collation == C_COLLATION_OID)
{
/*
* Some callers expect regexes to work for C_COLLATION_OID before
* catalog access is available, so we can't call
* pg_newlocale_from_collation().
*/
locale = &dummy_c_locale;
}
else
{
locale = pg_newlocale_from_collation(collation);
if (!locale->deterministic)
@@ -71,16 +55,6 @@ pg_set_regex_collation(Oid collation)
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("nondeterministic collations are not supported for regular expressions")));
if (locale->ctype_is_c)
{
/*
* C/POSIX collations use this path regardless of database
* encoding
*/
locale = &dummy_c_locale;
}
}
pg_regex_locale = locale;
}

13
src/backend/utils/adt/pg_locale.c
View File

@@ -106,6 +106,12 @@ static pg_locale_t default_locale = NULL;
static bool CurrentLocaleConvValid = false;
static bool CurrentLCTimeValid = false;
static struct pg_locale_struct c_locale = {
.deterministic = true,
.collate_is_c = true,
.ctype_is_c = true,
};
/* Cache for collation-related knowledge */
typedef struct
@@ -1185,6 +1191,13 @@ pg_newlocale_from_collation(Oid collid)
if (collid == DEFAULT_COLLATION_OID)
return default_locale;
/*
* Some callers expect C_COLLATION_OID to succeed even without catalog
* access.
*/
if (collid == C_COLLATION_OID)
return &c_locale;
if (!OidIsValid(collid))
elog(ERROR, "cache lookup failed for collation %u", collid);