tristaZero edited a comment on issue #8284:
URL: https://github.com/apache/shardingsphere/issues/8284#issuecomment-734255476


   Hi @junwen12221 ,
   
   Sorry for my late response, as I am writing a demo to implement the query 
optimization and federated SQL these days. 
   Your explanation makes sense to me. My big thanks for your share!  
   From 
[104-optimizer](https://github.com/MyCATApache/Mycat2/blob/master/doc/104-optimizer.md),
 I know you are specializing in Calcite and query optimization. I wonder 
whether you are interested in this community to participate in this feature? My 
big welcome. : )
   
   BTW, what do you think `ProjectableFilterableTable`? I am considering using 
it instead of `TranslatableTable` to get data from actual databases. Given 
`push down` rule, I suppose `ProjectableFilterableTable` is enough to filter 
rows. Besides, it seems `TranslatableTable` has the same function but is more 
complicated. Do you think which scenario will make us choose 
`TranslatableTable` rather than `ProjectableFilterableTable`?
   
   Looking forward to your any innovative ideas.
   
   Best wishes,
   Trista


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