[PR] Fix MQTT measurement validation [iotdb]

["jt2594838 (via GitHub)" <gi...@apache.org>]

jt2594838 opened a new pull request, #18215:
URL: https://github.com/apache/iotdb/pull/18215

   ## Description
   
   Validate tree-model MQTT measurements with `PathUtils.checkIsLegalSingleMeasurementsAndUpdate` before constructing the insert statement. This aligns MQTT writes with the RPC write path and rejects invalid single-node measurement names such as `a.b`.
   
   Add an MQTT integration test that publishes an invalid measurement followed by a valid marker in the same payload, then verifies that only the valid timeseries is created.
   
   ## Tests
   
   - `mvn test -pl external-service-impl/mqtt`
   - `mvn verify -DskipUTs -Dit.test=IoTDBMQTTServiceJsonIT#testIllegalMeasurementIsRejected -DfailIfNoTests=false -Dfailsafe.failIfNoSpecifiedTests=false -Drat.skip=true -pl integration-test -am -P with-integration-tests`
   
   <hr>
   
   This PR has:
   - [x] been self-reviewed.
   - [x] added integration tests.
   - [x] been tested in a test IoTDB cluster.
   
   <hr>
   
   ##### Key changed/added classes (or packages if there are too many classes) in this PR
   
   - `MPPPublishHandler`
   - `IoTDBMQTTServiceJsonIT`


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Re: [PR] Fix MQTT measurement validation [iotdb]

["HTHou (via GitHub)" <gi...@apache.org>]

HTHou merged PR #18215:
URL: https://github.com/apache/iotdb/pull/18215


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