rluvaton commented on code in PR #18325:
URL: https://github.com/apache/datafusion/pull/18325#discussion_r2469944410


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datafusion/physical-plan/src/aggregates/group_values/metrics.rs:
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@@ -0,0 +1,207 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+//! Metrics for the various group-by implementations.
+
+use crate::metrics::{ExecutionPlanMetricsSet, MetricBuilder, Time};
+
+pub(crate) struct GroupByMetrics {
+    /// Time spent evaluating the inputs to the aggregate functions.
+    pub(crate) aggregate_arguments_time: Time,
+    /// Time spent performing the aggregation itself.

Review Comment:
   ```suggestion
       /// Time spent performing the group by (e.g. in case of hash aggregation 
this would be searching and building the hash table) and evaluating the 
aggregate expressions themself (e.g. summing all elements and counting number 
of elements for `avg` aggregate).
   ```



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