fantacy2001 edited a comment on issue #4861: two tables left join with 
different routing rules are not supported
URL: 
https://github.com/apache/incubator-shardingsphere/issues/4861#issuecomment-604801451
 
 
   > Can you use SQL to explain your expected behaviour?
   
   shardingsphere's route is no problem. 
   i mean a convention is :  
   
   ```sql
   select a.*,b.* from a left join b on a.col = b.col where a.col = '123'
   ```
   
   but not :     
   
   ```sql
   select a.*,b.* from a left join b on a.col = b.col where a.col = '123' and 
b.col = '123'
   ```
   
   t does not affect the function, but talk about whether it is possible to 
optimize it
   

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