jayzhan211 commented on code in PR #10560:
URL: https://github.com/apache/datafusion/pull/10560#discussion_r1631125762
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datafusion/functions-aggregate/src/first_last.rs:
##########
@@ -31,20 +31,28 @@ use datafusion_common::{
use datafusion_expr::function::{AccumulatorArgs, StateFieldsArgs};
use datafusion_expr::utils::{format_state_name, AggregateOrderSensitivity};
use datafusion_expr::{
- Accumulator, AggregateUDFImpl, ArrayFunctionSignature, Signature,
TypeSignature,
- Volatility,
+ Accumulator, AggregateExt, AggregateUDFImpl, ArrayFunctionSignature, Expr,
Signature,
+ TypeSignature, Volatility,
};
use datafusion_physical_expr_common::aggregate::utils::get_sort_options;
use datafusion_physical_expr_common::sort_expr::{
limited_convert_logical_sort_exprs_to_physical, LexOrdering,
PhysicalSortExpr,
};
-make_udaf_expr_and_func!(
- FirstValue,
- first_value,
- "Returns the first value in a group of values.",
- first_value_udaf
-);
+create_func!(FirstValue, first_value_udaf);
+
+/// Returns the first value in a group of values.
+pub fn first_value(expression: Expr, order_by: Option<Vec<Expr>>) -> Expr {
+ if let Some(order_by) = order_by {
+ first_value_udaf()
+ .call(vec![expression])
+ .order_by(order_by)
+ .build()
+ .unwrap()
Review Comment:
I think it is fine to unwrap since udaf.call() is guaranteed to be
Expr::AggregateFunction
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