liukun4515 commented on PR #2192:
URL: 
https://github.com/apache/arrow-datafusion/pull/2192#issuecomment-1098076947

   > > I think we should add the function in
   > > 
https://github.com/apache/arrow-datafusion/blob/28a6da3d2d175eb9d2f4ff8a6ea58e7c22dae97c/ballista/rust/core/proto/datafusion.proto#L203
   > > 
   > > proto
   > 
   > Yes , but there is some issue in #2221 but in df it just rewrite 
`APPROX_MEDIAN` to `APPROX_PERCENTILE(0.5)`
   
   My thought is that we should add 
   ```
   APPROX_PERCENTILE_CONT_WITH_WEIGHT = 16;
   ```
   behind the  `APPROX_MEDIAN=15; ` in the proto file.


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