drop global temporary table can only drop global temporary table

[hooopo]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

create database b;
use b;
set tidb_enable_noop_functions = on;
CREATE TEMPORARY TABLE `temp_table` (`id` bigint NOT NULL AUTO_INCREMENT PRIMARY KEY);
DROP TEMPORARY TABLE `temp_table`;
error: mysql: 8007: `drop global temporary table` can only drop global temporary table

2. What did you expect to see? (Required)

MySQL:

create database a;
Query OK, 1 row affected (0.01 sec)

mysql> use a;
Database changed
mysql> CREATE TEMPORARY TABLE `temp_table` (`id` bigint NOT NULL AUTO_INCREMENT PRIMARY KEY);
Query OK, 0 rows affected (0.00 sec)

mysql> DROP TEMPORARY TABLE `temp_table`;
Query OK, 0 rows affected (0.01 sec)

3. What did you see instead (Required)

error: mysql: 8007: drop global temporary table can only drop global temporary table

4. What is your TiDB version? (Required)

 tidb_version()
-------------------------------------------------------------------
 Release Version: v5.2.0-alpha-281-g737fa5b74                     +
 Edition: Community                                               +
 Git Commit Hash: 737fa5b743c365e6bd7a7c30c54f9cb299b01e8d        +
 Git Branch: HEAD                                                 +
 UTC Build Time: 2021-07-14 12:03:19                              +
 GoVersion: go1.16.5                                              +
 Race Enabled: false                                              +
 TiKV Min Version: v3.0.0-60965b006877ca7234adaced7890d7b029ed1306+
 Check Table Before Drop: false

[ti-srebot]

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