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Posted to reviews@iotdb.apache.org by GitBox <gi...@apache.org> on 2021/07/27 03:39:53 UTC

[GitHub] [iotdb] juice411 opened a new issue #3630: 查询返回结果中小数点后面的值被自动截取了

juice411 opened a new issue #3630:
URL: https://github.com/apache/iotdb/issues/3630


   如图：
   ![cfa3c8ac224601cded0592a4d2f20bc](https://user-images.githubusercontent.com/10968514/127091639-6229ac08-70a3-43d7-aded-219535238db9.png)
   


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[GitHub] [iotdb] HTHou removed a comment on issue #3630: 查询返回结果中小数点后面的值被自动截取了

Posted by GitBox <gi...@apache.org>.
HTHou removed a comment on issue #3630:
URL: https://github.com/apache/iotdb/issues/3630#issuecomment-887452183


   > 如何对线上系统做修改？修改完后影响已归档数据吗
   
   这个相当于修改序列属性了，暂时不支持修改。只能新建一个序列重新写入了。。。


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[GitHub] [iotdb] juice411 commented on issue #3630: 查询返回结果中小数点后面的值被自动截取了

Posted by GitBox <gi...@apache.org>.
juice411 commented on issue #3630:
URL: https://github.com/apache/iotdb/issues/3630#issuecomment-887465187


   这个方案可以，多谢！


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[GitHub] [iotdb] qiaojialin commented on issue #3630: 查询返回结果中小数点后面的值被自动截取了

Posted by GitBox <gi...@apache.org>.
qiaojialin commented on issue #3630:
URL: https://github.com/apache/iotdb/issues/3630#issuecomment-887463718


   改 iotdb-engine.properties 里的这个参数：
   float_precision=6
   反注释重启生效。不影响已归档数据，只影响新写的数据。


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[GitHub] [iotdb] juice411 commented on issue #3630: 查询返回结果中小数点后面的值被自动截取了

Posted by GitBox <gi...@apache.org>.
juice411 commented on issue #3630:
URL: https://github.com/apache/iotdb/issues/3630#issuecomment-887449907


   如何对线上系统做修改？修改完后影响已归档数据吗


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[GitHub] [iotdb] HTHou commented on issue #3630: 查询返回结果中小数点后面的值被自动截取了

Posted by GitBox <gi...@apache.org>.
HTHou commented on issue #3630:
URL: https://github.com/apache/iotdb/issues/3630#issuecomment-887452183


   > 如何对线上系统做修改？修改完后影响已归档数据吗
   
   这个相当于修改序列属性了，暂时不支持修改。只能新建一个序列重新写入了。。。


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[GitHub] [iotdb] HTHou edited a comment on issue #3630: 查询返回结果中小数点后面的值被自动截取了

Posted by GitBox <gi...@apache.org>.
HTHou edited a comment on issue #3630:
URL: https://github.com/apache/iotdb/issues/3630#issuecomment-887448256


   这是因为使用了 RLE编码方式对于浮点数是有损编码导致的，如果需要保证精度，对于浮点数可以使用 gorilla 编码。


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[GitHub] [iotdb] qiaojialin closed issue #3630: 查询返回结果中小数点后面的值被自动截取了

Posted by GitBox <gi...@apache.org>.
qiaojialin closed issue #3630:
URL: https://github.com/apache/iotdb/issues/3630


   


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[GitHub] [iotdb] HTHou commented on issue #3630: 查询返回结果中小数点后面的值被自动截取了

Posted by GitBox <gi...@apache.org>.
HTHou commented on issue #3630:
URL: https://github.com/apache/iotdb/issues/3630#issuecomment-887442247


   show timeseries看看序列的详细信息？


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[GitHub] [iotdb] juice411 commented on issue #3630: 查询返回结果中小数点后面的值被自动截取了

Posted by GitBox <gi...@apache.org>.
juice411 commented on issue #3630:
URL: https://github.com/apache/iotdb/issues/3630#issuecomment-887443725


   ------------------&nbsp;原始邮件&nbsp;------------------
   发件人:                                                                                                                        "apache/iotdb"                                                                                    ***@***.***&gt;;
   发送时间:&nbsp;2021年7月27日(星期二) 晚上7:43
   ***@***.***&gt;;
   ***@***.******@***.***&gt;;
   主题:&nbsp;Re: [apache/iotdb] 查询返回结果中小数点后面的值被自动截取了 (#3630)
   
   
   
   
   
    
   show timeseries看看序列的详细信息？
    
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   You are receiving this because you authored the thread.
   Reply to this email directly, view it on GitHub, or unsubscribe.


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[GitHub] [iotdb] HTHou commented on issue #3630: 查询返回结果中小数点后面的值被自动截取了

Posted by GitBox <gi...@apache.org>.
HTHou commented on issue #3630:
URL: https://github.com/apache/iotdb/issues/3630#issuecomment-887448256


   这是因为使用了 RLE编码对于浮点数是有损压缩导致的，如果需要保证精度，对于浮点数可以使用 gorilla 编码。


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[GitHub] [iotdb] juice411 commented on issue #3630: 查询返回结果中小数点后面的值被自动截取了

Posted by GitBox <gi...@apache.org>.
juice411 commented on issue #3630:
URL: https://github.com/apache/iotdb/issues/3630#issuecomment-887444725


   ![image](https://user-images.githubusercontent.com/10968514/127148467-01254fbf-8e41-45aa-84ca-b7d6a8fd6759.png)
   


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