[GitHub] [iotdb] 140378476 opened a new issue #2131: Precision lost and incompatible precisions between select and select last.

[GitBox]

140378476 opened a new issue #2131:
URL: https://github.com/apache/iotdb/issues/2131


   **Describe the bug**
   1. I can not get precise result of float values using  `select` query.
   2. When executing `select` and `select last`, I got float values in 
different precisions.
   
   **To Reproduce**
   Steps to reproduce the behavior:
   1. Create timeseries: ` CREATE TIMESERIES root.t.d WITH DATATYPE=FLOAT, 
ENCODING=RLE`
   2. Insert data: `INSERT INTO root.t(timestamp,d) VALUES(1,1.23456789)`
   3. Select data: `SELECT * FROM root.t`, the returned value is `1.23`.
   4. Select data using last: ` SELECT LAST * FROM root.t`, the returned value 
is `1.2345679`.
   
   **Expected behavior**
   It should return at least the precise float value instead of an approximate 
one. 
   The result is expected to at least be the same as the returned value using 
select last.
   
   **Screenshots**
   
   
![图片](https://user-images.githubusercontent.com/21256331/100367025-958aba80-303c-11eb-8bd6-2c2aa1527670.png)
   
   
   **Desktop (please complete the following information):**
    - OS: Windows10
    - Version iotdb 0.10.1
   
   
   
   **Additional context**
   No
   


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