alamb commented on a change in pull request #909:
URL: https://github.com/apache/arrow-datafusion/pull/909#discussion_r695031745
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File path: datafusion/src/physical_plan/coalesce_partitions.rs
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@@ -43,12 +45,17 @@ use pin_project_lite::pin_project;
pub struct CoalescePartitionsExec {
/// Input execution plan
input: Arc<dyn ExecutionPlan>,
+ /// Execution metrics
Review comment:
This is the pattern that instrumented operators now follow:
1. They have a new `metrics: ExecutionPlanMetricsSet` field
2. During `execute()` they create new `BaselineMetrics`
3. They add `elapsed_time` timer during their CPU intensive work
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