RaigorJiang opened a new issue, #22183:
URL: https://github.com/apache/shardingsphere/issues/22183
## Bug Report
### Which version of ShardingSphere did you use?
master a1de9c34
### Which project did you use? ShardingSphere-JDBC or ShardingSphere-Proxy?
ShardingSphere-Proxy
### Expected behavior
select from shardingsphere.sharding_table_statistics can get correct results
### Actual behavior
```sql
mysql> show tables;
+---------------------------+------------+
| Tables_in_shardingsphere | Table_type |
+---------------------------+------------+
| sharding_table_statistics | BASE TABLE |
+---------------------------+------------+
1 row in set (0.00 sec)
mysql> select * from sharding_table_statistics;
ERROR 30000 (HY000): Unknown exception: null
```
Log
```
java.util.NoSuchElementException: null
at
java.util.LinkedHashMap$LinkedHashIterator.nextNode(LinkedHashMap.java:721)
at
java.util.LinkedHashMap$LinkedValueIterator.next(LinkedHashMap.java:747)
at
org.apache.shardingsphere.infra.rewrite.engine.GenericSQLRewriteEngine.rewrite(GenericSQLRewriteEngine.java:50)
at
org.apache.shardingsphere.infra.rewrite.SQLRewriteEntry.rewrite(SQLRewriteEntry.java:78)
at
org.apache.shardingsphere.infra.context.kernel.KernelProcessor.rewrite(KernelProcessor.java:65)
at
org.apache.shardingsphere.infra.context.kernel.KernelProcessor.generateExecutionContext(KernelProcessor.java:52)
at
org.apache.shardingsphere.proxy.backend.communication.jdbc.JDBCDatabaseCommunicationEngine.execute(JDBCDatabaseCommunicationEngine.java:125)
at
org.apache.shardingsphere.proxy.frontend.mysql.command.query.text.fieldlist.MySQLComFieldListPacketExecutor.execute(MySQLComFieldListPacketExecutor.java:74)
at
org.apache.shardingsphere.proxy.frontend.command.CommandExecutorTask.executeCommand(CommandExecutorTask.java:111)
at
org.apache.shardingsphere.proxy.frontend.command.CommandExecutorTask.run(CommandExecutorTask.java:78)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
```
### Steps to reproduce the behavior, such as: SQL to execute, sharding rule
configuration, when exception occur etc.
1. Start Proxy
2. Use shardingsphere;
3. select * from sharding_table_statistics;
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