[GitHub] [shardingsphere] leolv123 commented on issue #7072: select 'count' column data, why return null?

Tue, 25 Aug 2020 23:30:52 -0700 


leolv123 commented on issue #7072:
URL: https://github.com/apache/shardingsphere/issues/7072#issuecomment-680686618


   > Hi @leolv123
   > First, these actual SQLs are correct, aren't they?
   > Is there any `null` or other special values in `count` column?
   
   I found the problem，It's caused by the mapping
   
![image](https://user-images.githubusercontent.com/34678371/91268534-1a4d0a80-e7a8-11ea-96e2-f3e4750178ad.png)
   
   but there are other problems, why there a 'count' field in the query 
results, data merging will execute GroupByMemoryMergedResult
   
![image](https://user-images.githubusercontent.com/34678371/91268860-a3fcd800-e7a8-11ea-86fa-a4268b90ccc9.png)
   
   
   
   
   


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