Bug#25830 SHOW TABLE STATUS behaves differently depending on table name

replace wild_case_compare with my_wildcmp which is multibyte safe function

mysql-test/r/lowercase_utf8.result

+set names utf8;
+create table `Ö` (id int);
+show tables from test like 'Ö';
+Tables_in_test (Ö)
+ö
+show tables from test like 'ö';
+Tables_in_test (ö)
+ö
+drop table `Ö`;

mysql-test/t/lowercase_utf8-master.opt

+--lower-case-table-names=1 --character-set-server=utf8
+
+
+

mysql-test/t/lowercase_utf8.test

+#
+# Bug#25830 SHOW TABLE STATUS behaves differently depending on table name
+#
+set names utf8;
+create table `Ö` (id int);
+show tables from test like 'Ö';
+show tables from test like 'ö';
+drop table `Ö`;
+

sql/sql_show.cc

@@ -287,11 +287,17 @@ find_files(THD *thd, List<char> *files, const char *db,
 #ifndef NO_EMBEDDED_ACCESS_CHECKS
   uint col_access=thd->col_access;
 #endif
+  uint wild_length= 0;
   TABLE_LIST table_list;
   DBUG_ENTER("find_files");
 
-  if (wild && !wild[0])
-    wild=0;
+  if (wild)
+  {
+    if (!wild[0])
+      wild= 0;
+    else
+      wild_length= strlen(wild);
+  }
 
   bzero((char*) &table_list,sizeof(table_list));
 
@@ -340,7 +346,10 @@ find_files(THD *thd, List<char> *files, const char *db,
       {
 	if (lower_case_table_names)
 	{
-	  if (wild_case_compare(files_charset_info, file->name, wild))
+          if (my_wildcmp(files_charset_info,
+                         file->name, file->name + strlen(file->name),
+                         wild, wild + wild_length,
+                         wild_prefix, wild_one, wild_many))
             continue;
 	}
 	else if (wild_compare(file->name,wild,0))