datafusion 48.0.1

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// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
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// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

use arrow::{
    array::{Float32Array, Float64Array},
    datatypes::{DataType, Field, Schema},
    record_batch::RecordBatch,
};
use criterion::{criterion_group, criterion_main, Criterion};
use datafusion::prelude::SessionContext;
use datafusion::{datasource::MemTable, error::Result};
use futures::executor::block_on;
use std::sync::Arc;
use tokio::runtime::Runtime;

async fn query(ctx: &SessionContext, rt: &Runtime, sql: &str) {
    // execute the query
    let df = rt.block_on(ctx.sql(sql)).unwrap();
    criterion::black_box(rt.block_on(df.collect()).unwrap());
}

fn create_context(array_len: usize, batch_size: usize) -> Result<SessionContext> {
    // define a schema.
    let schema = Arc::new(Schema::new(vec![
        Field::new("f32", DataType::Float32, false),
        Field::new("f64", DataType::Float64, false),
    ]));

    // define data.
    let batches = (0..array_len / batch_size)
        .map(|i| {
            RecordBatch::try_new(
                schema.clone(),
                vec![
                    Arc::new(Float32Array::from(vec![i as f32; batch_size])),
                    Arc::new(Float64Array::from(vec![i as f64; batch_size])),
                ],
            )
            .unwrap()
        })
        .collect::<Vec<_>>();

    let ctx = SessionContext::new();

    // declare a table in memory. In spark API, this corresponds to createDataFrame(...).
    let provider = MemTable::try_new(schema, vec![batches])?;
    ctx.register_table("t", Arc::new(provider))?;

    Ok(ctx)
}

fn criterion_benchmark(c: &mut Criterion) {
    let array_len = 524_288; // 2^19
    let batch_size = 4096; // 2^12
    let ctx = create_context(array_len, batch_size).unwrap();
    let rt = Runtime::new().unwrap();

    c.bench_function("struct", |b| {
        b.iter(|| block_on(query(&ctx, &rt, "select struct(f32, f64) from t")))
    });
}

criterion_group!(benches, criterion_benchmark);
criterion_main!(benches);