MDEV-32973 SHOW TABLES LIKE shows temporary tables with non-matching names

* compare both db and table name
* use the correct charset

mysql-test/main/lowercase_fs_off.result

@@ -271,3 +271,26 @@ CREATE TABLE t1 (a Mariadb_schema.date);
 ERROR HY000: Unknown data type: 'Mariadb_schema.date'
 CREATE TABLE t1 (a mariadb_schema.date);
 DROP TABLE t1;
+# End of 10.3 tests
+#
+# MDEV-32973 SHOW TABLES LIKE shows temporary tables with non-matching names
+#
+create temporary table t1 (a int);
+create temporary table t2 (a int);
+create temporary table T1 (a int);
+show tables like 't1';
+Tables_in_test (t1)
+t1
+select table_name from information_schema.tables where table_schema='test'
+  and table_name='t1';
+table_name
+t1
+show tables like '_1';
+Tables_in_test (_1)
+T1
+t1
+show tables like 't%';
+Tables_in_test (t%)
+t2
+t1
+# End of 11.2 tests

mysql-test/main/lowercase_fs_off.test

@@ -146,3 +146,19 @@ CREATE TABLE t1 (a Mariadb_schema.date);
 
 CREATE TABLE t1 (a mariadb_schema.date);
 DROP TABLE t1;
+
+--echo # End of 10.3 tests
+
+--echo #
+--echo # MDEV-32973 SHOW TABLES LIKE shows temporary tables with non-matching names
+--echo #
+create temporary table t1 (a int);
+create temporary table t2 (a int);
+create temporary table T1 (a int);
+show tables like 't1';
+select table_name from information_schema.tables where table_schema='test'
+  and table_name='t1';
+show tables like '_1';
+show tables like 't%';
+
+--echo # End of 11.2 tests

mysql-test/main/lowercase_table2.result

@@ -377,3 +377,36 @@ SHOW CREATE DATABASE db1;
 Database	Create Database
 db1	CREATE DATABASE `db1` /*!40100 DEFAULT CHARACTER SET utf8mb3 COLLATE utf8mb3_general_ci */
 DROP DATABASE Db1;
+USE test;
+# End of 10.4 tests
+#
+# MDEV-32973 SHOW TABLES LIKE shows temporary tables with non-matching names
+#
+create temporary table t2 (a int);
+create temporary table T1 (a int);
+show tables;
+Tables_in_test
+t1
+t2
+show tables like 't1';
+Tables_in_test (t1)
+t1
+show tables like 'T1';
+Tables_in_test (T1)
+t1
+select table_name from information_schema.tables where table_schema='test'
+  and table_name='t1';
+table_name
+t1
+select table_name from information_schema.tables where table_schema='test'
+  and table_name='T1';
+table_name
+t1
+show tables like '_1';
+Tables_in_test (_1)
+t1
+show tables like 't%';
+Tables_in_test (t%)
+t1
+t2
+# End of 11.2 tests

mysql-test/main/lowercase_table2.test

@@ -328,3 +328,24 @@ ALTER DATABASE Db1 DEFAULT CHARACTER SET utf8;
 SHOW CREATE DATABASE Db1;
 SHOW CREATE DATABASE db1;
 DROP DATABASE Db1;
+USE test;
+
+--echo # End of 10.4 tests
+
+--echo #
+--echo # MDEV-32973 SHOW TABLES LIKE shows temporary tables with non-matching names
+--echo #
+# temp tables don't preserve the letter case despite lower-case-table-names=2
+create temporary table t2 (a int);
+create temporary table T1 (a int);
+show tables;
+show tables like 't1';
+show tables like 'T1';
+select table_name from information_schema.tables where table_schema='test'
+  and table_name='t1';
+select table_name from information_schema.tables where table_schema='test'
+  and table_name='T1';
+show tables like '_1';
+show tables like 't%';
+
+--echo # End of 11.2 tests

mysql-test/suite/rpl/r/rpl_ddl.result

@@ -343,7 +343,6 @@ TEST-INFO: SLAVE:  The INSERT is committed (Succeeded)
 connection master;
 SHOW TABLES LIKE 't2';
 Tables_in_mysqltest1 (t2)
-t23
 connection slave;
 SHOW TABLES LIKE 't2';
 Tables_in_mysqltest1 (t2)

sql/sql_show.cc

@@ -5215,6 +5215,20 @@ class Warnings_only_error_handler : public Internal_error_handler
 };
 
 
+static bool wildcmpcs(const LEX_CSTRING &str, const LEX_CSTRING &pat)
+{
+  return table_alias_charset->wildcmp(str.str, str.str + str.length,
+                                      pat.str, pat.str + pat.length,
+                                      '\\', '_', '%');
+}
+
+static bool strcmpcs(const LEX_CSTRING &str, const LEX_CSTRING &pat)
+{
+  return table_alias_charset->strnncoll(str.str, str.length,
+                                        pat.str, pat.length, 0);
+}
+
+
 /**
   @brief          Fill I_S tables whose data are retrieved
                   from frm files and storage engine
@@ -5346,15 +5360,20 @@ int get_all_tables(THD *thd, TABLE_LIST *tables, COND *cond)
   {
     All_tmp_tables_list::Iterator it(*open_tables_state_backup.temporary_tables);
     TMP_TABLE_SHARE *share_temp;
-    const char *lookup_db= plan->lookup_field_vals.db_value.str;
-    int (*cmp)(CHARSET_INFO *, const char *, const char *)=
-      plan->lookup_field_vals.wild_db_value
-      ? wild_case_compare : system_charset_info->coll->strcasecmp;
+    bool (*cmp_db)(const LEX_CSTRING &, const LEX_CSTRING &)=
+      plan->lookup_field_vals.wild_db_value ? wildcmpcs : strcmpcs;
+    bool (*cmp_table)(const LEX_CSTRING &, const LEX_CSTRING &)=
+      plan->lookup_field_vals.wild_table_value ? wildcmpcs : strcmpcs;
     while ((share_temp= it++))
     {
-      if (lookup_db)
+      if (plan->lookup_field_vals.db_value.str)
+      {
+        if (cmp_db(share_temp->db, plan->lookup_field_vals.db_value))
+          continue;
+      }
+      if (plan->lookup_field_vals.table_value.str)
       {
-        if (cmp(system_charset_info, share_temp->db.str, lookup_db))
+        if (cmp_table(share_temp->table_name, plan->lookup_field_vals.table_value))
           continue;
       }