[Bug] 多设备查询最新值报错

### Search before asking

- [X] I searched in the [issues](https://github.com/apache/iotdb/issues) and found nothing similar.

### Version

1.0.1

### Describe the bug and provide the minimal reproduce step

查询多设备最新值

select last 进水COD, `11`, CO2, 水管流速, 膜产水状态, 功能码, TJCTSB1_Manual_start, TJCTSB1_Manual_stop, JCS_In_TN from root.ln_1.tb_6340, root.ln_1.tb_0014, root.ln_1.tb_6141

### What did you expect to see?

正确结果

### What did you see instead?

Msg: 301: null
2023-03-17 16:05:46,526 [Query-Worker-Thread-11$20230317_080546_52613_1.1.0] WARN o.a.i.d.m.e.s.AbstractDriverThread:80 - [ExecuteFailed]
java.lang.NullPointerException: null
at org.apache.iotdb.db.mpp.execution.operator.process.last.LastQueryUtil.appendLastValue(LastQueryUtil.java:108)
at org.apache.iotdb.db.mpp.execution.operator.process.last.LastQueryMergeOperator.next(LastQueryMergeOperator.java:171)
at org.apache.iotdb.db.mpp.execution.driver.Driver.processInternal(Driver.java:193)
at org.apache.iotdb.db.mpp.execution.driver.Driver.lambda$processFor$1(Driver.java:131)
at org.apache.iotdb.db.mpp.execution.driver.Driver.tryWithLock(Driver.java:277)
at org.apache.iotdb.db.mpp.execution.driver.Driver.processFor(Driver.java:112)
at org.apache.iotdb.db.mpp.execution.schedule.DriverTaskThread.execute(DriverTaskThread.java:64)
at org.apache.iotdb.db.mpp.execution.schedule.AbstractDriverThread.run(AbstractDriverThread.java:74)
2023-03-17 16:05:46,527 [pool-30-IoTDB-ClientRPC-Processor-6] WARN o.a.i.d.u.ErrorHandlingUtils:90 - Status code: 301, Query Statement: "select last 进水COD, CO2, 水管流速, 膜产水状态, 功能码, TJCTSB1_Manual_start, TJCTSB1_Manual_stop, JCS_In_TN from root.ln_1.tb_6340, root.ln_1.tb_0014, root.ln_1.tb_6141". executeStatement failed
org.apache.iotdb.commons.exception.IoTDBException: java.lang.NullPointerException
at org.apache.iotdb.db.mpp.plan.execution.QueryExecution.dealWithException(QueryExecution.java:428)
at org.apache.iotdb.db.mpp.plan.execution.QueryExecution.getResult(QueryExecution.java:411)
at org.apache.iotdb.db.mpp.plan.execution.QueryExecution.getByteBufferBatchResult(QueryExecution.java:446)
at org.apache.iotdb.db.utils.QueryDataSetUtils.convertQueryResultByFetchSize(QueryDataSetUtils.java:387)
at org.apache.iotdb.db.service.thrift.impl.ClientRPCServiceImpl.lambda$static$0(ClientRPCServiceImpl.java:162)
at org.apache.iotdb.db.service.thrift.impl.ClientRPCServiceImpl.executeStatementInternal(ClientRPCServiceImpl.java:240)
at org.apache.iotdb.db.service.thrift.impl.ClientRPCServiceImpl.executeStatementV2(ClientRPCServiceImpl.java:398)
at org.apache.iotdb.service.rpc.thrift.IClientRPCService$Processor$executeStatementV2.getResult(IClientRPCService.java:3509)
at org.apache.iotdb.service.rpc.thrift.IClientRPCService$Processor$executeStatementV2.getResult(IClientRPCService.java:3489)
at org.apache.thrift.ProcessFunction.process(ProcessFunction.java:38)
at org.apache.iotdb.db.service.thrift.ProcessorWithMetrics.process(ProcessorWithMetrics.java:64)
at org.apache.thrift.server.TThreadPoolServer$WorkerProcess.run(TThreadPoolServer.java:248)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: java.lang.NullPointerException: null
at org.apache.iotdb.db.mpp.execution.operator.process.last.LastQueryUtil.appendLastValue(LastQueryUtil.java:108)
at org.apache.iotdb.db.mpp.execution.operator.process.last.LastQueryMergeOperator.next(LastQueryMergeOperator.java:171)
at org.apache.iotdb.db.mpp.execution.driver.Driver.processInternal(Driver.java:193)
at org.apache.iotdb.db.mpp.execution.driver.Driver.lambda$processFor$1(Driver.java:131)
at org.apache.iotdb.db.mpp.execution.driver.Driver.tryWithLock(Driver.java:277)
at org.apache.iotdb.db.mpp.execution.driver.Driver.processFor(Driver.java:112)
at org.apache.iotdb.db.mpp.execution.schedule.DriverTaskThread.execute(DriverTaskThread.java:64)
at org.apache.iotdb.db.mpp.execution.schedule.AbstractDriverThread.run(AbstractDriverThread.java:74)

### Anything else?

_No response_

### Are you willing to submit a PR?

- [ ] I'm willing to submit a PR!

Commencez par LastQueryUtil.java à la ligne 108 et suivez la façon dont LastQueryMergeOperator.java à la ligne 171 traite la requête LAST pour plusieurs appareils. Reproduisez le SQL signalé avec IoTDB 1.0.1 ou une configuration équivalente, puis vérifiez que la requête renvoie les valeurs les plus récentes correctes sans NullPointerException.

Rédigé par le modèle d'indexation à partir du texte de l'issue.