Thread: pgsql: Add SQL function CASEFOLD().
Add SQL function CASEFOLD(). 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 Branch ------ master Details ------- https://git.postgresql.org/pg/commitdiff/bfc5992069cf00b189af83d96a83ae5ebb65e938 Modified Files -------------- doc/src/sgml/func.sgml | 46 ++++++++++++++++- src/backend/utils/adt/formatting.c | 69 ++++++++++++++++++++++++++ src/backend/utils/adt/oracle_compat.c | 16 ++++++ src/backend/utils/adt/pg_locale.c | 24 +++++++++ src/backend/utils/adt/pg_locale_builtin.c | 10 ++++ src/backend/utils/adt/pg_locale_icu.c | 58 ++++++++++++++++++++++ src/include/catalog/catversion.h | 2 +- src/include/catalog/pg_proc.dat | 3 ++ src/include/utils/formatting.h | 1 + src/include/utils/pg_locale.h | 3 ++ src/test/regress/expected/collate.icu.utf8.out | 24 +++++++++ src/test/regress/expected/collate.utf8.out | 14 ++++++ src/test/regress/sql/collate.icu.utf8.sql | 5 ++ src/test/regress/sql/collate.utf8.sql | 6 +++ 14 files changed, 278 insertions(+), 3 deletions(-)