Fix predicate_rows_pruned & predicate_rows_matched metrics (#18980)

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Author: xudong963

datafusion/core/src/datasource/physical_plan/parquet.rs

@@ -1874,6 +1874,100 @@ mod tests {
         assert_contains!(&explain, "projection=[c1]");
     }
 
+    #[tokio::test]
+    async fn parquet_exec_metrics_with_multiple_predicates() {
+        // Test that metrics are correctly calculated when multiple predicates
+        // are pushed down (connected with AND). This ensures we don't double-count
+        // rows when multiple predicates filter the data sequentially.
+
+        // Create a batch with two columns: c1 (string) and c2 (int32)
+        // Total: 10 rows
+        let c1: ArrayRef = Arc::new(StringArray::from(vec![
+            Some("foo"), // 0 - passes c1 filter, fails c2 filter (5 <= 10)
+            Some("bar"), // 1 - fails c1 filter
+            Some("bar"), // 2 - fails c1 filter
+            Some("baz"), // 3 - passes both filters (20 > 10)
+            Some("foo"), // 4 - passes both filters (12 > 10)
+            Some("bar"), // 5 - fails c1 filter
+            Some("baz"), // 6 - passes both filters (25 > 10)
+            Some("foo"), // 7 - passes c1 filter, fails c2 filter (7 <= 10)
+            Some("bar"), // 8 - fails c1 filter
+            Some("qux"), // 9 - passes both filters (30 > 10)
+        ]));
+
+        let c2: ArrayRef = Arc::new(Int32Array::from(vec![
+            Some(5),
+            Some(15),
+            Some(8),
+            Some(20),
+            Some(12),
+            Some(9),
+            Some(25),
+            Some(7),
+            Some(18),
+            Some(30),
+        ]));
+
+        let batch = create_batch(vec![("c1", c1), ("c2", c2)]);
+
+        // Create filter: c1 != 'bar' AND c2 > 10
+        //
+        // First predicate (c1 != 'bar'):
+        //   - Rows passing: 0, 3, 4, 6, 7, 9 (6 rows)
+        //   - Rows pruned: 1, 2, 5, 8 (4 rows)
+        //
+        // Second predicate (c2 > 10) on remaining 6 rows:
+        //   - Rows passing: 3, 4, 6, 9 (4 rows with c2 = 20, 12, 25, 30)
+        //   - Rows pruned: 0, 7 (2 rows with c2 = 5, 7)
+        //
+        // Expected final metrics:
+        //   - pushdown_rows_matched: 4 (final result)
+        //   - pushdown_rows_pruned: 4 + 2 = 6 (cumulative)
+        //   - Total: 4 + 6 = 10
+
+        let filter = col("c1").not_eq(lit("bar")).and(col("c2").gt(lit(10)));
+
+        let rt = RoundTrip::new()
+            .with_predicate(filter)
+            .with_pushdown_predicate()
+            .round_trip(vec![batch])
+            .await;
+
+        let metrics = rt.parquet_exec.metrics().unwrap();
+
+        // Verify the result rows
+        assert_snapshot!(batches_to_string(&rt.batches.unwrap()),@r###"
+            +-----+----+
+            | c1  | c2 |
+            +-----+----+
+            | baz | 20 |
+            | foo | 12 |
+            | baz | 25 |
+            | qux | 30 |
+            +-----+----+
+        "###);
+
+        // Verify metrics - this is the key test
+        let pushdown_rows_matched = get_value(&metrics, "pushdown_rows_matched");
+        let pushdown_rows_pruned = get_value(&metrics, "pushdown_rows_pruned");
+
+        assert_eq!(
+            pushdown_rows_matched, 4,
+            "Expected 4 rows to pass both predicates"
+        );
+        assert_eq!(
+            pushdown_rows_pruned, 6,
+            "Expected 6 rows to be pruned (4 by first predicate + 2 by second predicate)"
+        );
+
+        // The sum should equal the total number of rows
+        assert_eq!(
+            pushdown_rows_matched + pushdown_rows_pruned,
+            10,
+            "matched + pruned should equal total rows"
+        );
+    }
+
     #[tokio::test]
     async fn parquet_exec_has_no_pruning_predicate_if_can_not_prune() {
         // batch1: c1(string)

datafusion/datasource-parquet/src/row_filter.rs

@@ -470,14 +470,33 @@ pub fn build_row_filter(
         });
     }
 
+    // To avoid double-counting metrics when multiple predicates are used:
+    // - All predicates should count rows_pruned (cumulative pruned rows)
+    // - Only the last predicate should count rows_matched (final result)
+    // This ensures: rows_matched + rows_pruned = total rows processed
+    let total_candidates = candidates.len();
+
     candidates
         .into_iter()
-        .map(|candidate| {
+        .enumerate()
+        .map(|(idx, candidate)| {
+            let is_last = idx == total_candidates - 1;
+
+            // All predicates share the pruned counter (cumulative)
+            let predicate_rows_pruned = rows_pruned.clone();
+
+            // Only the last predicate tracks matched rows (final result)
+            let predicate_rows_matched = if is_last {
+                rows_matched.clone()
+            } else {
+                metrics::Count::new()
+            };
+
             DatafusionArrowPredicate::try_new(
                 candidate,
                 metadata,
-                rows_pruned.clone(),
-                rows_matched.clone(),
+                predicate_rows_pruned,
+                predicate_rows_matched,
                 time.clone(),
             )
             .map(|pred| Box::new(pred) as _)