aokolnychyi commented on code in PR #6776:
URL: https://github.com/apache/iceberg/pull/6776#discussion_r1100982048


##########
spark/v3.3/spark/src/main/java/org/apache/iceberg/spark/source/SparkCopyOnWriteScan.java:
##########
@@ -123,8 +127,17 @@ public void filter(Filter[] filters) {
               tasks().stream()
                   .filter(file -> 
fileLocations.contains(file.file().path().toString()))
                   .collect(Collectors.toList());
+
+          LOG.info(
+              "{}/{} tasks for table {} matched runtime file filter",
+              filteredTasks.size(),
+              tasks().size(),
+              table().name());
+
           resetTasks(filteredTasks);
         }
+      } else {
+        LOG.warn("Unsupported runtime filter {}", filter);
       }

Review Comment:
   I overlooked this in the initial implementation. There should be no use case 
where we can't convert a runtime filter for the copy-on-write scan. If it 
happens, we should warn the user.



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