Jefffrey commented on code in PR #19043:
URL: https://github.com/apache/datafusion/pull/19043#discussion_r2580596595


##########
datafusion/physical-plan/src/filter.rs:
##########
@@ -690,6 +690,8 @@ struct FilterExecMetrics {
     baseline_metrics: BaselineMetrics,
     // Selectivity of the filter, calculated as output_rows / input_rows
     selectivity: RatioMetrics,
+    // Remember to update `docs/source/user-guide/metrics.md` when adding new 
metrics
+    // , or modifying metrics comments

Review Comment:
   ```suggestion
       // Remember to update `docs/source/user-guide/metrics.md` when adding 
new metrics,
       // or modifying metrics comments
   ```
   
   We'd have to add these comments to all metric structs? Is there a way we can 
take a macro based approach, similar to UDFs?



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