Shreyaskr1409 commented on code in PR #15504:
URL: https://github.com/apache/datafusion/pull/15504#discussion_r2021132605
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datafusion/physical-expr/src/aggregate.rs:
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@@ -97,6 +97,167 @@ impl AggregateExprBuilder {
/// Constructs an `AggregateFunctionExpr` from the builder
///
/// Note that an [`Self::alias`] must be provided before calling this
method.
+ ///
+ /// # Example: Create an `AggregateUDF`
+ ///
+ /// In the following example, `AggregateFunctionExpr` will be built using
`AggregateExprBuilder`
+ /// which provides a build function.
+ ///
+ /// First we will create an `Accumulator` which will be used to further
implement `AggregateUDFImpl`.
+ /// After implementing `AggregateUDFImpl`, it could be used to pass in as
a parameter to create an `AggregateExprBuilder`.
+ /// `AggregateExprBuilder` could the be used to generate
`AggregateFunctionExpr` after chaining
+ /// queries on top of each other.
+ ///
+ /// ```
Review Comment:
this specific part is tested
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