[GitHub] [calcite] jinxing64 opened a new pull request #1500: [CALCITE-3403] Prune columns for ProjectableFilterableTable when Proj…

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jinxing64 opened a new pull request #1500: [CALCITE-3403] Prune columns for ProjectableFilterableTable when Proj…
URL: https://github.com/apache/calcite/pull/1500
 
 
   …ect is not simple mapping (Jin Xing)
   
   Say `beatles` is a `ProjectableFilterableTable`, below Sqls fail to do column pruning by `BindableTableScan`
   ```
   Schema of beatles:
   i int
   j int
   k int
   
   select k, 3 from beatles;
   select k + j from beatles;
   ```
   
   The reason is that `ProjectableFilterableTable` only works when the Project is a simple mapping.
   
    

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