hint doesn't work after inlining CTE

[wjhuang2016]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

create table t1 (a int, b int, key(a));
create table t2 (a int, b int, key(a));
set @@tidb_enable_inl_join_inner_multi_pattern=on;
desc with cte as (select a, count(b) from t2 group by a) select /*+ INL_JOIN(cte) */  * from t1, cte where t1.a=cte.a;

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

Use index join.

3. What did you see instead (Required)

mysql> desc with cte as (select a, count(b) from t2 group by a) select /*+ INL_JOIN(cte) */  * from t1, cte where t1.a=cte.a;
+------------------------------------+----------+-----------+---------------+------------------------------------------------------------------------------------------+
| id                                 | estRows  | task      | access object | operator info                                                                            |
+------------------------------------+----------+-----------+---------------+------------------------------------------------------------------------------------------+
| Projection_13                      | 9990.00  | root      |               | sys.t1.a, sys.t1.b, sys.t2.a, Column#13                                                  |
| └─HashJoin_46                      | 9990.00  | root      |               | inner join, equal:[eq(sys.t1.a, sys.t2.a)]                                               |
|   ├─HashAgg_71(Build)              | 7992.00  | root      |               | group by:sys.t2.a, funcs:count(Column#29)->Column#13, funcs:firstrow(sys.t2.a)->sys.t2.a |
|   │ └─TableReader_72               | 7992.00  | root      |               | data:HashAgg_64                                                                          |
|   │   └─HashAgg_64                 | 7992.00  | cop[tikv] |               | group by:sys.t2.a, funcs:count(sys.t2.b)->Column#29                                      |
|   │     └─Selection_70             | 9990.00  | cop[tikv] |               | not(isnull(sys.t2.a))                                                                    |
|   │       └─TableFullScan_69       | 10000.00 | cop[tikv] | table:t2      | keep order:false, stats:pseudo                                                           |
|   └─TableReader_60(Probe)          | 9990.00  | root      |               | data:Selection_59                                                                        |
|     └─Selection_59                 | 9990.00  | cop[tikv] |               | not(isnull(sys.t1.a))                                                                    |
|       └─TableFullScan_58           | 10000.00 | cop[tikv] | table:t1      | keep order:false, stats:pseudo                                                           |
+------------------------------------+----------+-----------+---------------+------------------------------------------------------------------------------------------+
10 rows in set, 1 warning (0.01 sec)

mysql> show warnings;
+---------+------+-----------------------------------------------------------------------------------------------------------------------------------------------------+
| Level   | Code | Message                                                                                                                                             |
+---------+------+-----------------------------------------------------------------------------------------------------------------------------------------------------+
| Warning | 1815 | There are no matching table names for (cte) in optimizer hint /*+ INL_JOIN(cte) */ or /*+ TIDB_INLJ(cte) */. Maybe you can use the table alias name |
+---------+------+-----------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.01 sec)

4. What is your TiDB version? (Required)

b69f81b