lanrenbulan opened a new issue, #21385:
URL: https://github.com/apache/shardingsphere/issues/21385
## Question
```
mode:
type: Standalone
rules:
- !AUTHORITY
users:
- root@%:root
- !SQL_PARSER
sqlCommentParseEnabled: true
props:
max-connections-size-per-query: 1
kernel-executor-size: 16 # Infinite by default.
proxy-frontend-flush-threshold: 128 # The default value is 128.
proxy-hint-enabled: true
sql-show: true
check-table-metadata-enabled: false
```
[ERROR] 2022-10-08 16:50:34.293 [Connection-1-ThreadExecutor]
o.a.s.p.f.c.CommandExecutorTask - Exception occur:
java.lang.NullPointerException: Cannot invoke
"org.apache.shardingsphere.infra.federation.optimizer.context.parser.OptimizerParserContext.getDialectProps()"
because the return value of "java.util.Map.get(Object)" is null
at
org.apache.shardingsphere.infra.federation.executor.original.OriginalFederationExecutor.createConnection(OriginalFederationExecutor.java:92)
at
org.apache.shardingsphere.infra.federation.executor.original.OriginalFederationExecutor.executeQuery(OriginalFederationExecutor.java:83)
at
org.apache.shardingsphere.proxy.backend.communication.jdbc.JDBCDatabaseCommunicationEngine.doExecuteFederation(JDBCDatabaseCommunicationEngine.java:165)
at
org.apache.shardingsphere.proxy.backend.communication.jdbc.JDBCDatabaseCommunicationEngine.execute(JDBCDatabaseCommunicationEngine.java:123)
at
org.apache.shardingsphere.proxy.frontend.mysql.command.query.text.query.MySQLComQueryPacketExecutor.execute(MySQLComQueryPacketExecutor.java:94)
at
org.apache.shardingsphere.proxy.frontend.command.CommandExecutorTask.executeCommand(CommandExecutorTask.java:110)
at
org.apache.shardingsphere.proxy.frontend.command.CommandExecutorTask.run(CommandExecutorTask.java:77)
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)
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