[GitHub] [arrow-datafusion] MichaelScofield opened a new issue, #4552: user-defined aggregate function as window function

[GitBox <gi...@apache.org>]

MichaelScofield opened a new issue, #4552:
URL: https://github.com/apache/arrow-datafusion/issues/4552

   **Is your feature request related to a problem or challenge? Please describe what you are trying to do.**
   
   Currently DataFusion only supports window functions that are either pre-defined in `BuiltInWindowFunction`, or other built-in aggregate functions in `AggregateFunction`. It'll be better if people could use "user-defined aggregate function (UDAF)" as window function.
   
   **Describe the solution you'd like**
   
   Make window function accepts udaf like this:
   
   ```Rust
   enum WindowFunction {
       AggregateFunction(AggregateFunction),
       BuiltInWindowFunction(BuiltInWindowFunction),
   
       // new enum variant, define the udaf that is being used as window function
       AggregateUDF(Arc<AggregateUDF>),
   }
   ```
   
   And trying to find the corresponding udaf from context(`ContextProvider`) when interpreting window logical plan.
   
   **Describe alternatives you've considered**
   
   **Additional context**
   


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[GitHub] [arrow-datafusion] alamb closed issue #4552: user-defined aggregate function as window function

[GitBox <gi...@apache.org>]

alamb closed issue #4552: user-defined aggregate function as window function
URL: https://github.com/apache/arrow-datafusion/issues/4552


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