comphead commented on code in PR #3290:
URL: https://github.com/apache/datafusion-comet/pull/3290#discussion_r2732947276
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native/core/benches/row_columnar.rs:
##########
@@ -15,90 +15,822 @@
// specific language governing permissions and limitations
// under the License.
-use arrow::datatypes::DataType as ArrowDataType;
+//! Benchmarks for JVM shuffle row-to-columnar conversion.
+//!
+//! This benchmark measures the performance of converting Spark UnsafeRow
+//! to Arrow arrays via `process_sorted_row_partition()`, which is called
+//! by JVM shuffle (CometColumnarShuffle) when writing shuffle data.
+//!
+//! Covers:
+//! - Primitive types (Int64)
+//! - Struct (flat, nested, deeply nested)
+//! - List
+//! - Map
+
+use arrow::datatypes::{DataType, Field, Fields};
use comet::execution::shuffle::row::{
process_sorted_row_partition, SparkUnsafeObject, SparkUnsafeRow,
};
use comet::execution::shuffle::CompressionCodec;
-use criterion::{criterion_group, criterion_main, Criterion};
+use criterion::{criterion_group, criterion_main, BenchmarkId, Criterion};
+use std::sync::Arc;
use tempfile::Builder;
-const NUM_ROWS: usize = 10000;
const BATCH_SIZE: usize = 5000;
-const NUM_COLS: usize = 100;
-const ROW_SIZE: usize = SparkUnsafeRow::get_row_bitset_width(NUM_COLS) +
NUM_COLS * 8;
-fn benchmark(c: &mut Criterion) {
- let mut group = c.benchmark_group("row_array_conversion");
+/// Create a struct schema with the given number of int64 fields.
+fn make_struct_schema(num_fields: usize) -> DataType {
+ let fields: Vec<Field> = (0..num_fields)
+ .map(|i| Field::new(format!("f{}", i), DataType::Int64, true))
+ .collect();
+ DataType::Struct(Fields::from(fields))
+}
- group.bench_function("row_to_array", |b| {
- let spark_rows = (0..NUM_ROWS)
- .map(|_| {
- let mut spark_row =
SparkUnsafeRow::new_with_num_fields(NUM_COLS);
- let mut row = Row::new();
+/// Calculate the row size for a struct with the given number of fields.
+/// UnsafeRow layout: [null bits] [fixed-length values]
+/// For struct: the struct value is stored as offset+size (8 bytes) pointing
to nested row
+fn get_row_size(num_struct_fields: usize) -> usize {
+ // Top-level row has 1 column (the struct)
+ let top_level_bitset_width = SparkUnsafeRow::get_row_bitset_width(1);
+ // Struct pointer (offset + size) is 8 bytes
Review Comment:
```suggestion
// Struct pointer (offset + size) is 8 bytes on 64bit architectures
```
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