kosiew commented on code in PR #17282:
URL: https://github.com/apache/datafusion/pull/17282#discussion_r2293147256
##########
datafusion/core/src/physical_planner.rs:
##########
@@ -1782,21 +1782,28 @@ pub fn create_aggregate_expr_and_maybe_filter(
physical_input_schema: &Schema,
execution_props: &ExecutionProps,
) -> Result<AggregateExprWithOptionalArgs> {
- // unpack (nested) aliased logical expressions, e.g. "sum(col) as total"
+ // Unpack (potentially nested) aliased logical expressions, e.g. "sum(col)
as total"
+ // Some functions like `count_all()` create internal aliases,
+ // Unwrap all alias layers to get to the underlying aggregate function
let (name, human_display, e) = match e {
- Expr::Alias(Alias { expr, name, .. }) => {
- (Some(name.clone()), String::default(), expr.as_ref())
+ Expr::Alias(Alias { name, .. }) => {
+ let unaliased = e.clone().unalias_nested().data;
+ (
+ Some(name.clone()),
+ e.human_display().to_string(),
+ unaliased.clone(),
+ )
}
Review Comment:
Follow up action:
This is useful to be extracted to a helper function eg
Expr::unwrap_alias.
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