sql.rs

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//   http://www.apache.org/licenses/LICENSE-2.0
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use ballista::prelude::*;
use datafusion::prelude::CsvReadOptions;

/// This example demonstrates executing a simple query against an Arrow data source (CSV) and
/// fetching results, using SQL
#[tokio::main]
async fn main() -> Result<()> {
    let config = BallistaConfig::builder()
        .set("ballista.shuffle.partitions", "4")
        .build()?;
    let ctx = BallistaContext::remote("localhost", 50050, &config).await?;

    // register csv file with the execution context
    ctx.register_csv(
        "test",
        "testdata/aggregate_test_100.csv",
        CsvReadOptions::new(),
    )
    .await?;

    // execute the query
    let df = ctx
        .sql(
            "SELECT c1, MIN(c12), MAX(c12) \
        FROM test \
        WHERE c11 > 0.1 AND c11 < 0.9 \
        GROUP BY c1",
        )
        .await?;

    // print the results
    df.show().await?;

    Ok(())
}