alamb commented on code in PR #16858:
URL: https://github.com/apache/datafusion/pull/16858#discussion_r2228760094
##########
datafusion/core/src/physical_planner.rs:
##########
@@ -1358,6 +1358,9 @@ impl DefaultPhysicalPlanner {
physical_name(expr),
))?])),
}
+ } else if group_expr.is_empty() {
+ // No GROUP BY clause - create empty PhysicalGroupBy
+ Ok(PhysicalGroupBy::new(vec![], vec![], vec![]))
Review Comment:
I wonder if we should look into changing `group_expr`: Option<&[Expr]>` or
something so the compiler makes it more likely that we handle the difference
between an empty `Vec` vs `None`
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