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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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16
src/backend/utils/adt/oracle_compat.c
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@@ -126,6 +126,22 @@ initcap(PG_FUNCTION_ARGS)
PG_RETURN_TEXT_P(result);
}
Datum
casefold(PG_FUNCTION_ARGS)
{
text *in_string = PG_GETARG_TEXT_PP(0);
char *out_string;
text *result;
out_string = str_casefold(VARDATA_ANY(in_string),
VARSIZE_ANY_EXHDR(in_string),
PG_GET_COLLATION());
result = cstring_to_text(out_string);
pfree(out_string);
PG_RETURN_TEXT_P(result);
}
/********************************************************************
*