rluvaton commented on code in PR #18325:
URL: https://github.com/apache/datafusion/pull/18325#discussion_r2469846905


##########
datafusion/physical-plan/src/aggregates/row_hash.rs:
##########
@@ -430,6 +431,9 @@ pub(crate) struct GroupedHashAggregateStream {
 
     /// Execution metrics
     baseline_metrics: BaselineMetrics,
+
+    /// Aggregation-specific metrics
+    group_by_metrics: GroupByMetrics,

Review Comment:
   Can you also add a timer for building and searching (single timer) the the 
hash table (`group_values.intern`)
   
   or if you prefer we can leave that for later



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