lwtdev commented on issue #7548:
URL: https://github.com/apache/shardingsphere/issues/7548#issuecomment-696557749
I have just try create table after proxy start, it's also cause an npe
```sql
create table customer(id bigint(23) primary key );
ERROR 10002 (C1000): 2Unknown exception: [null]
```
- log
```
java.lang.NullPointerException: null
at
org.apache.shardingsphere.infra.executor.sql.context.ExecutionContextBuilder.getPrimaryKeyColumns(ExecutionContextBuilder.java:129)
at
org.apache.shardingsphere.infra.executor.sql.context.ExecutionContextBuilder.getSQLRuntimeContext(ExecutionContextBuilder.java:81)
at
org.apache.shardingsphere.infra.executor.sql.context.ExecutionContextBuilder.build(ExecutionContextBuilder.java:71)
at
org.apache.shardingsphere.infra.executor.sql.context.ExecutionContextBuilder.build(ExecutionContextBuilder.java:57)
at
org.apache.shardingsphere.infra.context.kernel.KernelProcessor.generateExecutionContext(KernelProcessor.java:53)
at
org.apache.shardingsphere.proxy.backend.communication.jdbc.JDBCDatabaseCommunicationEngine.execute(JDBCDatabaseCommunicationEngine.java:67)
at
org.apache.shardingsphere.proxy.backend.text.query.QueryBackendHandler.execute(QueryBackendHandler.java:64)
at
org.apache.shardingsphere.proxy.frontend.mysql.command.query.text.query.MySQLComQueryPacketExecutor.execute(MySQLComQueryPacketExecutor.java:62)
at
org.apache.shardingsphere.proxy.frontend.command.CommandExecutorTask.executeCommand(CommandExecutorTask.java:100)
at
org.apache.shardingsphere.proxy.frontend.command.CommandExecutorTask.run(CommandExecutorTask.java:76)
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)
```
In proxy 4.1.1 it was works well
```sql
mysql> create table customer(id bigint(23) primary key );
Query OK, 0 rows affected (0.14 sec)
mysql> show tables;
+---------------------------------+
| Tables_in_spsqltest_sharding_00 |
+---------------------------------+
| customer |
```
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