jayzhan211 commented on code in PR #9874:
URL: https://github.com/apache/arrow-datafusion/pull/9874#discussion_r1547021900
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datafusion/expr/src/function.rs:
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@@ -37,10 +38,36 @@ pub type ScalarFunctionImplementation =
pub type ReturnTypeFunction =
Arc<dyn Fn(&[DataType]) -> Result<Arc<DataType>> + Send + Sync>;
-/// Factory that returns an accumulator for the given aggregate, given
-/// its return datatype.
+/// Arguments passed to create an accumulator
+pub struct AccumulatorArgs<'a> {
+ // default arguments
+ pub data_type: &'a DataType, // the return type of the function
+ pub schema: &'a Schema, // the schema of the input arguments
+ pub ignore_nulls: bool, // whether to ignore nulls
+
+ // ordering arguments
+ pub sort_exprs: &'a [Expr], // the expressions of `order by`
Review Comment:
Another approach is always set ordering with `with_ordering(sort_exprs: &'a
[Expr])`.
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