Jefffrey commented on issue #2406:
URL: https://github.com/apache/datafusion/issues/2406#issuecomment-4591072606

   I think there's still some that weren't listed here that still don't support 
distinct.
   
   ## Explicitly denies
   
   stddev
   
   
https://github.com/apache/datafusion/blob/bb121a8fcdb9ca7fa53ee8bcf175844e2a6df7f3/datafusion/functions-aggregate/src/stddev.rs#L118-L123
   
   approx_median
   
   
https://github.com/apache/datafusion/blob/bb121a8fcdb9ca7fa53ee8bcf175844e2a6df7f3/datafusion/functions-aggregate/src/approx_median.rs#L130-L135
   
   ## May be missing support
   
   These functions don't explicitly use the `distinct` flag to handle distinct 
specific behaviour, but depending on their semantics maybe distinct doesn't 
make sense for them? Anyway just listing them:
   
   - 
https://github.com/apache/datafusion/blob/bb121a8fcdb9ca7fa53ee8bcf175844e2a6df7f3/datafusion/functions-aggregate/src/regr.rs
   - 
https://github.com/apache/datafusion/blob/bb121a8fcdb9ca7fa53ee8bcf175844e2a6df7f3/datafusion/functions-aggregate/src/nth_value.rs
   - 
https://github.com/apache/datafusion/blob/bb121a8fcdb9ca7fa53ee8bcf175844e2a6df7f3/datafusion/functions-aggregate/src/covariance.rs
   - 
https://github.com/apache/datafusion/blob/bb121a8fcdb9ca7fa53ee8bcf175844e2a6df7f3/datafusion/functions-aggregate/src/correlation.rs
   - 
https://github.com/apache/datafusion/blob/bb121a8fcdb9ca7fa53ee8bcf175844e2a6df7f3/datafusion/functions-aggregate/src/approx_percentile_cont.rs


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