Fix pg_iswcased(). Commits 630706ced0 and 9c8de15969 lost some encoding-specific nuances: in libc with EUC encodings, or in ICU with any non-UTF8 encoding, we cannot easily classify characters, so we must assume they are case-varying. Restore these behaviors.
Previously, ILIKE using an index scan could cause wrong results. Reported-by: Noah Misch <[email protected]> Discussion: https://postgr.es/m/[email protected] Backpatch-through: 19 Branch ------ REL_19_STABLE Details ------- https://git.postgresql.org/pg/commitdiff/b264391a846e8b5917b00dde2399c38843c75bb8 Modified Files -------------- src/backend/utils/adt/pg_locale.c | 5 +++++ src/backend/utils/adt/pg_locale_icu.c | 16 ++++++++++++++- src/backend/utils/adt/pg_locale_libc.c | 36 ++++++++++++++++++++++++++++++---- 3 files changed, 52 insertions(+), 5 deletions(-)
