地味にgrepから始める。
$ grep -r 'utf8mb4_0900_ai_ci' | grep -v mysql-test | grep -v scripts/fill_help_tables.sql | grep -v gunit
client/mysqltest.cc: &my_charset_utf8mb4_0900_ai_ci; /* Default charset */
cmake/character_sets.cmake: SET(DEFAULT_COLLATION "utf8mb4_0900_ai_ci")
include/m_ctype.h:extern MYSQL_PLUGIN_IMPORT CHARSET_INFO my_charset_utf8mb4_0900_ai_ci;
man/myisamchk.1:Character set: utf8mb4_0900_ai_ci (255)
mysys/charset-def.cc:extern CHARSET_INFO my_charset_utf8mb4_0900_ai_ci;
mysys/charset-def.cc: add_compiled_collation(&my_charset_utf8mb4_0900_ai_ci);
plugin/x/src/mysql_variables.cc: return &my_charset_utf8mb4_0900_ai_ci;
router/src/routing/src/sql_lexer.cc: if (underscore_cs == &my_charset_utf8mb4_0900_ai_ci) {
router/src/routing/src/sql_lexer_thd.h: &my_charset_utf8mb4_0900_ai_ci};
share/messages_to_clients.txt: eng "Invalid default collation %s: utf8mb4_0900_ai_ci or utf8mb4_general_ci …
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