TeslaCN opened a new issue, #17773:
URL: https://github.com/apache/shardingsphere/issues/17773
## Feature Request
### Is your feature request related to a problem?
Table without primary key but with unique index on a non-null column cannot
be scaled by ShardingSphere-Scaling.
```
mysql> show create table bmsql_item;
+------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table
|
+------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| bmsql_item | CREATE TABLE `bmsql_item` (
`i_id` int NOT NULL,
`i_name` varchar(24) COLLATE utf8mb4_unicode_ci DEFAULT NULL,
`i_price` decimal(5,2) DEFAULT NULL,
`i_data` varchar(50) COLLATE utf8mb4_unicode_ci DEFAULT NULL,
`i_im_id` int DEFAULT NULL,
UNIQUE KEY `unique_i_id` (`i_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci |
+------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)
```
```
[ERROR] 2022-05-18 13:56:28.801
[elasticjob-0130317c30317c3054317c626d73716c5f7368617264696e67-2]
o.a.s.d.p.s.r.RuleAlteredJob - job prepare failed,
0130317c30317c3054317c626d73716c5f7368617264696e67-1
org.apache.shardingsphere.data.pipeline.core.exception.PipelineJobCreationException:
Can not split range for table bmsql_item_1, reason: no primary key
at
org.apache.shardingsphere.data.pipeline.scenario.rulealtered.prepare.InventoryTaskSplitter.checkPrimaryKey(InventoryTaskSplitter.java:169)
at
org.apache.shardingsphere.data.pipeline.scenario.rulealtered.prepare.InventoryTaskSplitter.getInventoryPositions(InventoryTaskSplitter.java:149)
at
org.apache.shardingsphere.data.pipeline.scenario.rulealtered.prepare.InventoryTaskSplitter.splitByPrimaryKey(InventoryTaskSplitter.java:113)
at
org.apache.shardingsphere.data.pipeline.scenario.rulealtered.prepare.InventoryTaskSplitter.splitDumperConfig(InventoryTaskSplitter.java:88)
at
org.apache.shardingsphere.data.pipeline.scenario.rulealtered.prepare.InventoryTaskSplitter.splitInventoryData(InventoryTaskSplitter.java:77)
at
org.apache.shardingsphere.data.pipeline.scenario.rulealtered.RuleAlteredJobPreparer.initInventoryTasks(RuleAlteredJobPreparer.java:160)
at
org.apache.shardingsphere.data.pipeline.scenario.rulealtered.RuleAlteredJobPreparer.prepare(RuleAlteredJobPreparer.java:85)
at
org.apache.shardingsphere.data.pipeline.scenario.rulealtered.RuleAlteredJob.execute(RuleAlteredJob.java:50)
at
org.apache.shardingsphere.elasticjob.simple.executor.SimpleJobExecutor.process(SimpleJobExecutor.java:33)
at
org.apache.shardingsphere.elasticjob.simple.executor.SimpleJobExecutor.process(SimpleJobExecutor.java:29)
at
org.apache.shardingsphere.elasticjob.executor.ElasticJobExecutor.process(ElasticJobExecutor.java:172)
at
org.apache.shardingsphere.elasticjob.executor.ElasticJobExecutor.lambda$process$0(ElasticJobExecutor.java:153)
at
java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539)
at
com.google.common.util.concurrent.TrustedListenableFutureTask$TrustedFutureInterruptibleTask.runInterruptibly(TrustedListenableFutureTask.java:125)
at
com.google.common.util.concurrent.InterruptibleTask.run(InterruptibleTask.java:69)
at
com.google.common.util.concurrent.TrustedListenableFutureTask.run(TrustedListenableFutureTask.java:78)
at
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
at
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
at java.base/java.lang.Thread.run(Thread.java:833)
```
### Describe the feature you would like.
Supports scaling table without primary key but with unique index on non-null
column.
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