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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