datafusion-postgres 0.16.0

Exporting datafusion query engine with postgres wire protocol
Documentation 
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use pgwire::api::ClientInfo;

// Metadata keys for session-level settings
const METADATA_STATEMENT_TIMEOUT: &str = "statement_timeout_ms";
const METADATA_TIMEZONE: &str = "timezone";

/// Get statement timeout from client metadata
pub fn get_statement_timeout<C>(client: &C) -> Option<std::time::Duration>
where
    C: ClientInfo + ?Sized,
{
    client
        .metadata()
        .get(METADATA_STATEMENT_TIMEOUT)
        .and_then(|s| s.parse::<u64>().ok())
        .map(std::time::Duration::from_millis)
}

/// Set statement timeout in client metadata
pub fn set_statement_timeout<C>(client: &mut C, timeout: Option<std::time::Duration>)
where
    C: ClientInfo + ?Sized,
{
    let metadata = client.metadata_mut();
    if let Some(duration) = timeout {
        metadata.insert(
            METADATA_STATEMENT_TIMEOUT.to_string(),
            duration.as_millis().to_string(),
        );
    } else {
        metadata.remove(METADATA_STATEMENT_TIMEOUT);
    }
}

/// Get statement timeout from client metadata
pub fn get_timezone<C>(client: &C) -> Option<&str>
where
    C: ClientInfo + ?Sized,
{
    client.metadata().get(METADATA_TIMEZONE).map(|s| s.as_str())
}

/// Set statement timeout in client metadata
pub fn set_timezone<C>(client: &mut C, timezone: Option<&str>)
where
    C: ClientInfo + ?Sized,
{
    let metadata = client.metadata_mut();
    if let Some(timezone) = timezone {
        metadata.insert(METADATA_TIMEZONE.to_string(), timezone.to_string());
    } else {
        metadata.remove(METADATA_TIMEZONE);
    }
}