alamb commented on code in PR #20749:
URL: https://github.com/apache/datafusion/pull/20749#discussion_r2907571484
##########
datafusion/expr/src/logical_plan/plan.rs:
##########
@@ -3490,7 +3490,9 @@ pub struct Aggregate {
pub input: Arc<LogicalPlan>,
/// Grouping expressions
pub group_expr: Vec<Expr>,
- /// Aggregate expressions
+ /// Aggregate expressions.
+ ///
+ /// Note these *must* be either [`Expr::AggregateFunction`] or
[`Expr::Alias`]
Review Comment:
Maybe as a follow on PR -- to be clear this is not a new restriction, rather
it was an undocumented limitation.
I also believe this was the root cause of the issues @zhuqi-lucas was
hitting when he tried it in
- https://github.com/apache/datafusion/pull/15532
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