cmlmakahts opened a new pull request, #7145:
URL: https://github.com/apache/iotdb/pull/7145

   [PoC]
   
   1. Prepare dataset
   ``` sql
   create storage group root.ln;
   create timeseries root.ln.wf01.wt01.temperature with datatype=FLOAT 
,encoding=RLE;
   create timeseries root.ln.wf01.wt01.status with 
datatype=BOOLEAN,encoding=RLE;
   create timeseries root.ln.wf01.wt01.hardware with 
datatype=TEXT,encoding=PLAIN;
   create timeseries root.ln.wf01.wt01.score with datatype=INT32,encoding=RLE;
   insert into root.ln.wf01.wt01(time,status,temperature,hardware,score) 
values(1509525300000,TRUE,25.99,'V001',88);
   insert into root.ln.wf01.wt01(time,status,temperature,hardware) 
values(1509525360000,TRUE,25.99,'V002');
   insert into root.ln.wf01.wt01(time,status,temperature,hardware,score) 
values(1509525470000,TRUE,23.19,'V001',91);
   insert into root.ln.wf01.wt01(time,status,temperature,hardware) 
values(1509525490000,FALSE,26.92,'V002');
   insert into root.ln.wf01.wt01(time,status,hardware,score) 
values(1509580800000,FALSE,'V001',95);
   insert into root.ln.wf01.wt01(time,status,temperature,score) 
values(1509559200000,FALSE,26.92,90);
   insert into root.ln.wf01.wt01(time,status,temperature) 
values(1509638400000,TRUE,26.0);
   insert into root.ln.wf01.wt01(time,temperature,hardware) 
values(1509724800000,23.29,'V001');
   insert into root.ln.wf01.wt01(time,status,temperature,hardware) 
values(1509811200000,TRUE,24.19,'V002');
   insert into root.ln.wf01.wt01(time,status,temperature,score) 
values(1509897600000,FALSE,20.19,88);
   insert into root.ln.wf01.wt01(time,status,temperature) 
values(1509908400000,FALSE,20.19);
   insert into root.ln.wf01.wt01(time,temperature,score) 
values(1509984000000,22.12,86);
   insert into root.ln.wf01.wt01(time,status,temperature) 
values(1510069800000,FALSE,20.12);
   insert into root.ln.wf01.wt01(time,status,temperature,hardware) 
values(1510069920000,FALSE,21.22,'V001');
   insert into root.ln.wf01.wt01(time,status,temperature) 
values(1510070100000,TRUE,21.22);
   insert into root.ln.wf01.wt01(time,status,hardware,score) 
values(1510070370000,TRUE,'V002',93);
   insert into root.ln.wf01.wt01(time,status,temperature,hardware) 
values(1510070400000,TRUE,23.99,'V002');
   insert into root.ln.wf01.wt01(time,temperature,hardware) 
values(1541174400000,20.99,'V002');
   insert into root.ln.wf01.wt01(time,status,temperature,score) 
values(1541433600000,TRUE,25.99,89);
   insert into root.ln.wf01.wt01(time,status,hardware,score) 
values(1572883200000,TRUE,'V002',90);
   insert into root.ln.wf01.wt01(time,status,temperature,hardware) 
values(1573056000000,TRUE,24.19,'V001');
   ```
   2. export with option '-linesPerFile 1'
   ``` shell
   sh export-csv.sh -u root -pw root -h 192.168.42.102 -p 6667 -q "select * 
from root.**" -linesPerFile 2
   ```
   3. 21 lines export to 11 file, abc0_[0-10].csv
   
![image](https://user-images.githubusercontent.com/82880298/187019739-594b1e62-2f6d-4025-a8e2-787c6c212867.png)
   
   
   


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