[GitHub] [iotdb] jixuan1989 commented on issue #5809: 0.12.5 升级到0.13.0后，聚合查询求和时没有数据的行不会补零，而是返回了“null”

[GitBox <gi...@apache.org>]

jixuan1989 commented on issue #5809:
URL: https://github.com/apache/iotdb/issues/5809#issuecomment-1120402934

   > 聚合结果在时间序列没有数据时会返回 null，因为此时如果返回0的话就不知道是因为没有数据还是真正的sum值就是0。
   因此0.12.5返回 0 其实是个bug，0.13.0 修复了这一bug，后续 0.12.6也会修复这个bug。因此可能需要您对之前的代码判断做一些修改。
   
   hm... 
   if we have a time series `root.a.b`, but the series has no data. How about the following 4 sqls:
   1. select max(b) from root.*;
   2. select max(b) from root.* group by ([t1, t2], 5m);
   3. select max(b) from root.a;
   4. select max(b) from root.* group by ([t1, t2], 5m);
   5. 
   


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