MDEV-9014 SHOW TRIGGERS not case sensitive

use table_alias_charset for comparing table names, not files_charset_info

mysql-test/r/lowercase_fs_off.result

@@ -63,3 +63,8 @@ CREATE TRIGGER t1_bi BEFORE INSERT ON t1 FOR EACH ROW SET new.a= 1;
 RENAME TABLE t1 TO T1;
 ALTER TABLE T1 RENAME t1;
 DROP TABLE t1;
+create table t1 (a int);
+create trigger t1_bi before insert on t1 for each row set new.a= 1;
+show triggers like '%T1%';
+Trigger	Event	Table	Statement	Timing	Created	sql_mode	Definer	character_set_client	collation_connection	Database Collation
+drop table t1;

mysql-test/t/lowercase_fs_off.test

@@ -102,3 +102,11 @@ CREATE TRIGGER t1_bi BEFORE INSERT ON t1 FOR EACH ROW SET new.a= 1;
 RENAME TABLE t1 TO T1;
 ALTER TABLE T1 RENAME t1;
 DROP TABLE t1;
+
+#
+# MDEV-9014 SHOW TRIGGERS not case sensitive
+#
+create table t1 (a int);
+create trigger t1_bi before insert on t1 for each row set new.a= 1;
+show triggers like '%T1%';
+drop table t1;

sql/handler.cc

@@ -5116,7 +5116,7 @@ bool Discovered_table_list::add_table(const char *tname, size_t tlen)
     custom discover_table_names() method, that calls add_table() directly).
     Note: avoid comparing the same name twice (here and in add_file).
   */
-  if (wild && my_wildcmp(files_charset_info, tname, tname + tlen, wild, wend,
+  if (wild && my_wildcmp(table_alias_charset, tname, tname + tlen, wild, wend,
                          wild_prefix, wild_one, wild_many))
       return 0;