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Add SQL function CASEFOLD().

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Useful for caseless matching. Similar to LOWER(), but avoids edge-case
problems with using LOWER() for caseless matching.

For collations that support it, CASEFOLD() handles characters with
more than two case variations or multi-character case variations. Some
characters may fold to uppercase. The results of case folding are also
more stable across Unicode versions than LOWER() or UPPER().

Discussion: https://postgr.es/m/a1886ddfcd8f60cb3e905c93009b646b4cfb74c5.camel%40j-davis.com
Reviewed-by: Ian Lawrence Barwick
This commit is contained in:
Jeff Davis
2025-01-24 14:56:22 -08:00
parent f15538cd27
commit bfc5992069
14 changed files with 278 additions and 3 deletions
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3
src/include/utils/pg_locale.h
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@@ -134,6 +134,9 @@ extern size_t pg_strtitle(char *dest, size_t destsize,
extern size_t pg_strupper(char *dest, size_t destsize,
const char *src, ssize_t srclen,
pg_locale_t locale);
extern size_t pg_strfold(char *dest, size_t destsize,
const char *src, ssize_t srclen,
pg_locale_t locale);
extern int pg_strcoll(const char *arg1, const char *arg2, pg_locale_t locale);
extern int pg_strncoll(const char *arg1, ssize_t len1,
const char *arg2, ssize_t len2, pg_locale_t locale);