Function run 

pub fn run(
    conn: &Connection,
    config: &BenchConfig,
) -> Result<Vec<OperationResult>>

Run the bench workload and return per-operation results.

Each operation seeds its own data inside the supplied connection so callers can hand in either a fresh in-memory DB (for tests) or a disposable on-disk DB (for the CLI).

Errors

Returns the underlying db error if any of the seeded inserts or queries fail.