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Allow NULL version for individual collations.

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Remove the documented restriction that collation providers must either
return NULL for all collations or non-NULL for all collations.

Use NULL for glibc collations like "C.UTF-8", which might otherwise lead
future proposed commits to force unnecessary index rebuilds.

Reviewed-by: Peter Eisentraut <peter.eisentraut@2ndquadrant.com>
Discussion: https://postgr.es/m/CA%2BhUKGJvqup3s%2BJowVTcacZADO6dOhfdBmvOPHLS3KXUJu41Jw%40mail.gmail.com
This commit is contained in:
Thomas Munro
2020-03-25 15:53:24 +13:00
parent dd8e19132a
commit 382a821907
1 changed files with 17 additions and 4 deletions
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21
src/backend/utils/adt/pg_locale.c
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@ -1505,10 +1505,6 @@ pg_newlocale_from_collation(Oid collid)
/*
* Get provider-specific collation version string for the given collation from
* the operating system/library.
*
* A particular provider must always either return a non-NULL string or return
* NULL (if it doesn't support versions). It must not return NULL for some
* collcollate and not NULL for others.
*/
char *
get_collation_actual_version(char collprovider, const char *collcollate)
@ -1540,6 +1536,23 @@ get_collation_actual_version(char collprovider, const char *collcollate)
if (collprovider == COLLPROVIDER_LIBC)
{
#if defined(__GLIBC__)
char *copy = pstrdup(collcollate);
char *copy_suffix = strstr(copy, ".");
bool need_version = true;
/*
* Check for names like C.UTF-8 by chopping off the encoding suffix on
* our temporary copy, so we can skip the version.
*/
if (copy_suffix)
*copy_suffix = '\0';
if (pg_strcasecmp("c", copy) == 0 ||
pg_strcasecmp("posix", copy) == 0)
need_version = false;
pfree(copy);
if (!need_version)
return NULL;
/* Use the glibc version because we don't have anything better. */
collversion = pstrdup(gnu_get_libc_version());
#endif