return wrong results when accessing partition tables with tablesample #52282
Description
Bug Report
Please answer these questions before submitting your issue. Thanks!
1. Minimal reproduce step (Required)
mysql> create table t (a int, b varchar(255), primary key (a)) partition by hash(a) partitions 2;
Query OK, 0 rows affected (0.02 sec)
mysql> insert into t values (1, '1'), (2, '2'), (3, '3');
Query OK, 3 rows affected (0.00 sec)
Records: 3 Duplicates: 0 Warnings: 0
mysql> set @@tidb_partition_prune_mode='static';
Query OK, 0 rows affected (0.00 sec)
mysql> select * from t tablesample regions();
+---+------+
| a | b |
+---+------+
| 2 | 2 |
| 1 | 1 |
| 2 | 2 |
| 1 | 1 |
+---+------+
4 rows in set (0.00 sec)
mysql> set @@tidb_partition_prune_mode='dynamic';
Query OK, 0 rows affected, 2 warnings (0.00 sec)
mysql> select * from t tablesample regions();
+---+------+
| a | b |
+---+------+
| 2 | 2 |
| 1 | 1 |
+---+------+
2 rows in set (0.00 sec)
2. What did you expect to see? (Required)
Return the same result no matter whether it is dynamic or static node
3. What did you see instead (Required)
Dynamic and static mode return different results
4. What is your TiDB version? (Required)
Master