Function effective_sample_rate

src/adapter/src/statement_logging.rs:726–737

The effective rate at which statement execution should be sampled. This is the value of the session var `statement_logging_sample_rate`, constrained by the system var `statement_logging_max_sample_rate`.

(session: &Session, system_vars: &SystemVars)

/// This is the value of the session var `statement_logging_sample_rate`,
/// constrained by the system var `statement_logging_max_sample_rate`.
pub(crate) fn effective_sample_rate(session: &Session, system_vars: &SystemVars) -> f64 {
    let system_max: f64 = system_vars
        .statement_logging_max_sample_rate()
        .try_into()
        .expect("value constrained to be convertible to f64");
    let user_rate: f64 = session
        .vars()
        .get_statement_logging_sample_rate()
        .try_into()
        .expect("value constrained to be convertible to f64");
    f64::min(system_max, user_rate)
}

/// Helper function to decide whether to sample a statement execution.
/// Returns `true` if the statement should be sampled based on the sample rate.