more than one add index ddl jobs triggered with ingest type

[seiya-annie]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

triggered add index ddl for 64 tables in very short time

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

only one ddl will use ingest type to add index

3. What did you see instead (Required)

mysql> admin show ddl jobs;
+--------+-------------------+------------+------------------------+----------------------+-----------+----------+-----------+---------------------+---------------------+---------------------+----------+
| JOB_ID | DB_NAME           | TABLE_NAME | JOB_TYPE               | SCHEMA_STATE         | SCHEMA_ID | TABLE_ID | ROW_COUNT | CREATE_TIME         | START_TIME          | END_TIME            | STATE    |
+--------+-------------------+------------+------------------------+----------------------+-----------+----------+-----------+---------------------+---------------------+---------------------+----------+
|    444 | sysbench_64_7000w | sbtest56   | add index /* ingest */ | write reorganization |        89 |      251 |  68420064 | 2023-04-10 07:11:06 | 2023-04-10 07:11:06 | NULL                | running  |
|    445 | sysbench_64_7000w | sbtest58   | add index /* ingest */ | write reorganization |        89 |      305 |  41898210 | 2023-04-10 07:11:06 | 2023-04-10 07:11:06 | NULL                | running  |
|    446 | sysbench_64_7000w | sbtest63   | add index /* ingest */ | write reorganization |        89 |      268 |         0 | 2023-04-10 07:11:06 | 2023-04-10 07:11:06 | NULL                | running  |
|    447 | sysbench_64_7000w | sbtest19   | add index /* ingest */ | delete only          |        89 |      247 |         0 | 2023-04-10 07:11:06 | 2023-04-10 07:11:06 | NULL                | running  |
|    448 | sysbench_64_7000w | sbtest57   | add index /* ingest */ | delete only          |        89 |      339 |         0 | 2023-04-10 07:11:06 | 2023-04-10 07:11:06 | NULL                | running  |
|    449 | sysbench_64_7000w | sbtest15   | add index /* ingest */ | delete only          |        89 |      232 |         0 | 2023-04-10 07:11:06 | 2023-04-10 07:11:06 | NULL                | running  |

4. What is your TiDB version? (Required)

master