some partition/constraints expressions will cause DDL hangs forever #50972
Description
Bug Report
Please answer these questions before submitting your issue. Thanks!
1. Minimal reproduce step (Required)
> CREATE TABLE t (id int) PARTITION BY HASH( t.id ) PARTITIONS 4;
> show create table t;
> alter table t rename tx;
2. What did you expect to see? (Required)
success, in MySQL:
mysql> show create table t;
+-------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table |
+-------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------+
| t | CREATE TABLE `t` (
`id` int DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
/*!50100 PARTITION BY HASH (`id`)
PARTITIONS 4 */ |
+-------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.01 sec)
mysql> alter table t rename tx;
Query OK, 0 rows affected (0.08 sec)
3. What did you see instead (Required)
The rename DDL hangs:
mysql> CREATE TABLE t (id int) PARTITION BY HASH( t.id ) PARTITIONS 4;
Query OK, 0 rows affected (0.03 sec)
mysql> show create table t;
+-------+------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table |
+-------+------------------------------------------------------------------------------------------------------------------------------------------------------+
| t | CREATE TABLE `t` (
`id` int(11) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
PARTITION BY HASH (`t`.`id`) PARTITIONS 4 |
+-------+------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)
mysql> alter table t rename tx; --- this DDL hangs
We can see that the hash expression is t.id not id and when we rename this table, it schema load will fail:
[2024/02/05 10:33:28.159 +08:00] [ERROR] [partition.go:1197] ["wrong table partition expression"] [expression=`t`.`id`] [error="[planner:1054]Unknown column 't.id' in 'expression'"]
[2024/02/05 10:33:28.159 +08:00] [ERROR] [domain.go:286] ["failed to load schema diff"] [error="[planner:1054]Unknown column 't.id' in 'expression'"]
[2024/02/05 10:33:28.172 +08:00] [ERROR] [partition.go:1197] ["wrong table partition expression"] [expression=`t`.`id`] [error="[planner:1054]Unknown column 't.id' in 'expression'"]
[2024/02/05 10:33:28.172 +08:00] [ERROR] [domain.go:905] ["reload schema in loop failed"] [error="Build table `test`.`tx` schema failed: [planner:1054]Unknown column 't.id' in 'expression'"]
If we restart tidb server after that, the server will hang on loading schema and cannot be connected.
This also affects constraints like CREATE TABLE t1 (a int, check(t1.a > 1));