Struct ColumnTemperature 

pub struct ColumnTemperature {
    pub name: String,
    pub temperature: f64,
    pub window_updates: u64,
    pub total_updates: u64,
    pub last_update_us: u64,
}

Temperature tracking for a single column using Exponential Moving Average.

Temperature is computed as: temp_new = α × temp_current + (1-α) × temp_old where α = 0.1 (decay factor) and temp_current = updates_in_window / total_updates

Fields

name: String

Column name

temperature: f64

Current temperature (0.0 = cold, 1.0 = hot)

window_updates: u64

Updates in current window

total_updates: u64

Total updates since last decay

last_update_us: u64

Last update timestamp (micros)

Implementations

impl ColumnTemperature

pub fn new(name: String) -> Self

Create a new temperature tracker for a column

pub fn record_update(&mut self)

Record an update to this column

pub fn update_ema(&mut self, total_window_updates: u64)

Update temperature using EMA when window completes

α = 0.1 (decay factor) temp_new = α × temp_current + (1-α) × temp_old

pub fn is_hot(&self, threshold: f64) -> bool

Check if column is “hot” (above threshold)

Trait Implementations

impl Clone for ColumnTemperature

fn clone(&self) -> ColumnTemperature

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ColumnTemperature

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for ColumnTemperature

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for ColumnTemperature

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.