NGA-TRAN commented on a change in pull request #948:
URL: https://github.com/apache/arrow-datafusion/pull/948#discussion_r696870280
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File path: datafusion/src/physical_plan/sort_preserving_merge.rs
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@@ -1172,4 +1208,59 @@ mod tests {
assert_eq!(basic, partition);
}
+
+ #[tokio::test]
+ async fn test_merge_metrics() {
+ let a: ArrayRef = Arc::new(Int32Array::from(vec![1, 2]));
+ let b: ArrayRef = Arc::new(StringArray::from_iter(vec![Some("a"),
Some("c")]));
+ let b1 = RecordBatch::try_from_iter(vec![("a", a), ("b", b)]).unwrap();
+
+ let a: ArrayRef = Arc::new(Int32Array::from(vec![10, 20]));
+ let b: ArrayRef = Arc::new(StringArray::from_iter(vec![Some("b"),
Some("d")]));
+ let b2 = RecordBatch::try_from_iter(vec![("a", a), ("b", b)]).unwrap();
+
+ let schema = b1.schema();
+ let sort = vec![PhysicalSortExpr {
+ expr: col("b", &schema).unwrap(),
+ options: Default::default(),
+ }];
+ let exec = MemoryExec::try_new(&[vec![b1], vec![b2]], schema,
None).unwrap();
+ let merge = Arc::new(SortPreservingMergeExec::new(sort,
Arc::new(exec), 1024));
+
+ let collected = collect(merge.clone()).await.unwrap();
+ let expected = vec![
+ "+----+---+",
+ "| a | b |",
+ "+----+---+",
+ "| 1 | a |",
+ "| 10 | b |",
+ "| 2 | c |",
+ "| 20 | d |",
+ "+----+---+",
+ ];
+ assert_batches_eq!(expected, collected.as_slice());
+
+ // Now, validate metrics
+ let metrics = merge.metrics().unwrap();
+
+ assert!(metrics.output_rows().unwrap() > 0);
Review comment:
I think we can verify the exact output_rows here, right?
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