[GitHub] [shardingsphere] JiekerTime opened a new issue #9185: COUNT may have an out-of-bounds exception

Tue, 26 Jan 2021 21:30:12 -0800 


JiekerTime opened a new issue #9185:
URL: https://github.com/apache/shardingsphere/issues/9185


   The logic of COUNT() seems to be in 
GroupByMemoryMergedResult.setAggregationValueToMemoryRow, and the way to get 
the result here seems to be to call the getResult method：
   
![716041eea1ef12661c24bab527c70d4](https://user-images.githubusercontent.com/76552510/105947026-338b0900-601d-11eb-890c-c0ad3ae5e1c6.jpg)
   The logic of size is based on HashSet, and its return type is int type.：
   
![image](https://user-images.githubusercontent.com/76552510/105945651-88795000-601a-11eb-8b30-2bc36a66988a.png)
   
   If the future size exceeds the range of int, unexpected errors may occur.
   
   Then since HashMap is used, is it possible that it will cause some 
concurrency problems in the future?


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