diff options
Diffstat (limited to 'src/include')
| -rw-r--r-- | src/include/utils/pg_locale.h | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/src/include/utils/pg_locale.h b/src/include/utils/pg_locale.h index 7a70ec1173a..97b866b3444 100644 --- a/src/include/utils/pg_locale.h +++ b/src/include/utils/pg_locale.h @@ -47,6 +47,36 @@ extern struct lconv *PGLC_localeconv(void); extern void cache_locale_time(void); +struct pg_locale_struct; +typedef struct pg_locale_struct *pg_locale_t; + +/* methods that define collation behavior */ +struct collate_methods +{ + /* required */ + int (*strncoll) (const char *arg1, ssize_t len1, + const char *arg2, ssize_t len2, + pg_locale_t locale); + + /* required */ + size_t (*strnxfrm) (char *dest, size_t destsize, + const char *src, ssize_t srclen, + pg_locale_t locale); + + /* optional */ + size_t (*strnxfrm_prefix) (char *dest, size_t destsize, + const char *src, ssize_t srclen, + pg_locale_t locale); + + /* + * If the strnxfrm method is not trusted to return the correct results, + * set strxfrm_is_safe to false. It set to false, the method will not be + * used in most cases, but the planner still expects it to be there for + * estimation purposes (where incorrect results are acceptable). + */ + bool strxfrm_is_safe; +}; + /* * We use a discriminated union to hold either a locale_t or an ICU collator. * pg_locale_t is occasionally checked for truth, so make it a pointer. @@ -70,6 +100,9 @@ struct pg_locale_struct bool collate_is_c; bool ctype_is_c; bool is_default; + + const struct collate_methods *collate; /* NULL if collate_is_c */ + union { struct |