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消息主题：[ANNOUNCE] Apache IoTDB 0.12.6 released

消息内容示例：


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The   Apache   IoTDB   team is pleased to   announce   the release of   Apache   IoTDB  (incubating)  0.1012.06.



Apache   IoTDB   (incubating) (Database for Internet of Things) is an integrated data management engine designed for timeseries data. It provides users with services for data collection, storage and analysis. 

The current release is the 3rd major version of IoTDB, which provides many new features and improvements. A part of features are as follows:

* IOTDB-217 A new GROUPBY syntax, e.g., select avg(s1) from root.sg.d1.s1 GROUP BY ([1, 50), 5ms) * IOTDB-220 Add hot-load configuration function * IOTDB-292 Add load external tsfile feature * IOTDB-298 Support new Last point query. e.g, select last * from root * IOTDB-305 Add value filter function while executing align by device * IOTDB-396 Support new query clause: disable align, e.g., select * from root disable align * IOTDB-447 Support querying non-existing measurement and constant measurement * IOTDB-448 Add IN operation, e.g., where time in (1,2,3) * IOTDB-456 Support GroupByFill Query, e.g., select last_value(s1) from root.sg.d1 GROUP BY ([1, 10), 2ms) FILL(int32[previousUntilLast]) * IOTDB-497 Support Apache Flink Connector with IoTDB * IOTDB-565 MQTT Protocol Support, disabled by default, open in iotdb-engine.properties * IOTDB-588 Add tags and attributes management * Online upgrade from 0.9.x * Make JDBC OSGi usable and added a feature file * Allow count timeseries group by level=x using default path * IOTDB-700 Add OpenID Connect based JWT Access as alternative to Username / Password * IOTDB-715 Support previous time range in previousuntillast * IOTDB-719 add avg_series_point_number_threshold in config * IOTDB-734 Add Support for NaN in Double / Floats in SQL Syntax.

IoT native database with high performance for data management and analysis, deployable on the edge and the cloud.

This is a bug-fixed version of 0.12.5, which includes a number of improvements:
##Improvements
*[IOTDB-3515] Make the message clear when loading empty TsFile

##Bug Fixes
*[IOTDB-2773] Fix overlapped data should be consumed first bug
*[IOTDB-3135] Fix parameter max_select_unseq_file_num_in_each_unseq_compaction doesn't work
*[IOTDB-3292] Fix chunk size overflow in level compaction
*[IOTDB-3392] Fix File doesn't exist when moving TsFile when virtual_storage_group > 1
*[IOTDB-3398] Remove the exception when query meet a device is not in TsFile, which is a normal case
*[IOTDB-3602] Skip empty TsFile when loading directory
*[ISSUE-4399] When non-root user get an empty query result, return no permission error message
*[ISSUE-5809] Fix bug: sum aggregation result return 0 when no data
* Fix data in seq files overlapped


The full release note is available at: 
https://raw.githubusercontent.com/apache/incubator-iotdb/v0v0.12.16/RELEASE_NOTES.md

The release is available for download at: 
http://iotdb.apache.org/Download

Maven artifacts for JDBC driver, session SDK, TsFile SDK, Spark-connector, Hadoop-connector, Hive-connector and Flink-connector can be found at:
https://search.maven.org/search?q=g:org.apache.iotdb

Docker image of IoTDB server can be found at:

https://hub.docker.com/r/apache/iotdb

Python API package can be found at:

https://pypi.org/project/apache-iotdb/

Regards,
The Apache IoTDB team

=====

Disclaimer 




Docker image of IoTDB server can be found at:
https://hub.docker.com/r/apache/iotdb

Python API package can be found at:
https://pypi.org/project/apache-iotdb/


Regards,
The Apache IoTDB teamApache IoTDB (incubating) is an effort undergoing incubation at The
Apache Software Foundation (ASF), sponsored by the Apache Incubator.
Incubation is required of all newly accepted projects until a further
review indicates that the infrastructure, communications, and decision
making process have stabilized in a manner consistent with other
successful ASF projects. While incubation status is not necessarily a
reflection of the completeness or stability of the code, it does
indicate that the project has yet to be fully endorsed by the ASF.

更多参考例子：https://lists.apache.org/list.html?dev@iotdb.apache.org:gte=1d:announce

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