Allow pushdown if grouping set is empty

Author: LiaCastaneda

datafusion/physical-plan/src/aggregates/mod.rs

@@ -1057,7 +1057,10 @@ impl ExecutionPlan for AggregateExec {
             .flat_map(|(expr, _)| collect_columns(expr))
             .collect();
 
-        if !filter_columns.is_subset(&grouping_columns) {
+        // For aggregates with GROUP BY: only allow pushdown if filters reference grouping columns
+        // For aggregates without GROUP BY (e.g., SELECT COUNT(*)): allow pushdown of any filter
+        // since we're aggregating all rows into a single group anyway
+        if !grouping_columns.is_empty() && !filter_columns.is_subset(&grouping_columns) {
             // Filters reference non-grouping columns - not safe to push through
             let unsupported_filters: Vec<_> = parent_filters
                 .into_iter()