feat: rockets example (#306)

# Rationale for this change

Add an additional rockets example to help improve documentation.

# What changes are included in this PR?

Adding an example with a table of launch vehicles.

# Are these changes tested?

Yes.

.github/workflows/lint-and-test.yml

@@ -132,6 +132,8 @@ jobs:
         run: cargo run --example sushi
       - name: Run countries example
         run: cargo run --example countries
+      - name: Run rockets example
+        run: cargo run --example rockets
       - name: Run posql_db example (With Blitzar)
         run: bash crates/proof-of-sql/examples/posql_db/run_example.sh
       - name: Run posql_db example (Without Blitzar)

crates/proof-of-sql/Cargo.toml

@@ -131,6 +131,10 @@ required-features = [ "arrow" ]
 name = "countries"
 required-features = [ "arrow" ]
 
+[[example]]
+name = "rockets"
+required-features = [ "arrow" ]
+
 [[bench]]
 name = "posql_benches"
 harness = false

crates/proof-of-sql/examples/rockets/launch_vehicles.csv

@@ -0,0 +1,28 @@
+name,country,year,mtow
+Saturn V,USA,1967,2976000
+Falcon Heavy,USA,2018,1420788
+Space Shuttle,USA,1981,2041167
+Energia,USSR,1987,2400000
+Ariane 5,Europe,1996,780000
+Delta IV Heavy,USA,2004,733400
+Long March 5,China,2016,869000
+Proton,USSR/Russia,1965,705000
+Atlas V,USA,2002,546700
+H-IIA,Japan,2001,445000
+Soyuz,USSR/Russia,1966,308000
+Falcon 9,USA,2010,549054
+Vega,Europe,2012,137000
+PSLV,India,1993,320000
+GSLV Mk III,India,2017,640000
+Titan II,USA,1962,153800
+Angara A5,Russia,2014,1335000
+Delta II,USA,1989,231870
+Electron,New Zealand,2017,12500
+Antares,USA,2013,240000
+Zenit,USSR/Ukraine,1985,462000
+N1,USSR,1969,2735000
+New Glenn,USA,2024,1300000
+Redstone,USA,1953,29500
+Black Arrow,UK,1971,18800
+Diamant,France,1965,18000
+Pegasus,USA,1990,23300

crates/proof-of-sql/examples/rockets/main.rs

@@ -0,0 +1,132 @@
+//! This is a non-interactive example of using Proof of SQL with a rockets dataset.
+//! To run this, use `cargo run --release --example rockets`.
+//!
+//! NOTE: If this doesn't work because you do not have the appropriate GPU drivers installed,
+//! you can run `cargo run --release --example rockets --no-default-features --features="arrow cpu-perf"` instead. It will be slower for proof generation.
+
+use arrow::datatypes::SchemaRef;
+use arrow_csv::{infer_schema_from_files, ReaderBuilder};
+use proof_of_sql::{
+    base::database::{
+        arrow_schema_utility::get_posql_compatible_schema, OwnedTable, OwnedTableTestAccessor,
+        TestAccessor,
+    },
+    proof_primitive::dory::{
+        DynamicDoryCommitment, DynamicDoryEvaluationProof, ProverSetup, PublicParameters,
+        VerifierSetup,
+    },
+    sql::{parse::QueryExpr, postprocessing::apply_postprocessing_steps, proof::QueryProof},
+};
+use rand::{rngs::StdRng, SeedableRng};
+use std::{fs::File, time::Instant};
+
+// We generate the public parameters and the setups used by the prover and verifier for the Dory PCS.
+// The `max_nu` should be set such that the maximum table size is less than `2^(2*max_nu-1)`.
+const DORY_SETUP_MAX_NU: usize = 8;
+// This should be a "nothing-up-my-sleeve" phrase or number.
+const DORY_SEED: [u8; 32] = *b"7a1b3c8d2e4f9g6h5i0j7k2l8m3n9o1p";
+
+/// # Panics
+/// Will panic if the query does not parse or the proof fails to verify.
+fn prove_and_verify_query(
+    sql: &str,
+    accessor: &OwnedTableTestAccessor<DynamicDoryEvaluationProof>,
+    prover_setup: &ProverSetup,
+    verifier_setup: &VerifierSetup,
+) {
+    // Parse the query:
+    println!("Parsing the query: {sql}...");
+    let now = Instant::now();
+    let query_plan = QueryExpr::<DynamicDoryCommitment>::try_new(
+        sql.parse().unwrap(),
+        "rockets".parse().unwrap(),
+        accessor,
+    )
+    .unwrap();
+    println!("Done in {} ms.", now.elapsed().as_secs_f64() * 1000.);
+
+    // Generate the proof and result:
+    print!("Generating proof...");
+    let now = Instant::now();
+    let (proof, provable_result) = QueryProof::<DynamicDoryEvaluationProof>::new(
+        query_plan.proof_expr(),
+        accessor,
+        &prover_setup,
+    );
+    println!("Done in {} ms.", now.elapsed().as_secs_f64() * 1000.);
+
+    // Verify the result with the proof:
+    print!("Verifying proof...");
+    let now = Instant::now();
+    let result = proof
+        .verify(
+            query_plan.proof_expr(),
+            accessor,
+            &provable_result,
+            &verifier_setup,
+        )
+        .unwrap();
+    let result = apply_postprocessing_steps(result.table, query_plan.postprocessing());
+    println!("Verified in {} ms.", now.elapsed().as_secs_f64() * 1000.);
+
+    // Display the result
+    println!("Query Result:");
+    println!("{result:?}");
+}
+
+fn main() {
+    let mut rng = StdRng::from_seed(DORY_SEED);
+    let public_parameters = PublicParameters::rand(DORY_SETUP_MAX_NU, &mut rng);
+    let prover_setup = ProverSetup::from(&public_parameters);
+    let verifier_setup = VerifierSetup::from(&public_parameters);
+
+    let filename = "./crates/proof-of-sql/examples/rockets/launch_vehicles.csv";
+    let inferred_schema =
+        SchemaRef::new(infer_schema_from_files(&[filename.to_string()], b',', None, true).unwrap());
+    let posql_compatible_schema = get_posql_compatible_schema(&inferred_schema);
+
+    let rockets_batch = ReaderBuilder::new(posql_compatible_schema)
+        .with_header(true)
+        .build(File::open(filename).unwrap())
+        .unwrap()
+        .next()
+        .unwrap()
+        .unwrap();
+
+    // Load the table into an "Accessor" so that the prover and verifier can access the data/commitments.
+    let mut accessor =
+        OwnedTableTestAccessor::<DynamicDoryEvaluationProof>::new_empty_with_setup(&prover_setup);
+    accessor.add_table(
+        "rockets.launch_vehicles".parse().unwrap(),
+        OwnedTable::try_from(rockets_batch).unwrap(),
+        0,
+    );
+
+    prove_and_verify_query(
+        "SELECT COUNT(*) AS total_rockets FROM launch_vehicles",
+        &accessor,
+        &prover_setup,
+        &verifier_setup,
+    );
+
+    prove_and_verify_query(
+        "SELECT country, MAX(mtow) as max_mtow, COUNT(*) as rocket_count FROM launch_vehicles GROUP BY country ORDER BY max_mtow DESC",
+        &accessor,
+        &prover_setup,
+        &verifier_setup,
+    );
+
+    prove_and_verify_query(
+        "SELECT name FROM launch_vehicles WHERE country = 'USA'",
+        &accessor,
+        &prover_setup,
+        &verifier_setup,
+    );
+
+    prove_and_verify_query(
+        "SELECT name FROM launch_vehicles WHERE mtow > 100000 and mtow < 150000",
+        &accessor,
+        &prover_setup,
+        &verifier_setup,
+    );
+}