Struct StddevSampFunction 

pub struct StddevSampFunction { /* private fields */ }

STDDEV_SAMP aggregate function (Sample Standard Deviation)

Computes the sample standard deviation of all non-NULL values. Formula: sqrt(sum((x - mean)^2) / (N - 1)) Uses Bessel’s correction (N-1 instead of N).

Trait Implementations

impl AggregateFunction for StddevSampFunction

fn name(&self) -> &str

Get the function name

fn info(&self) -> FunctionInfo

Get function information

fn accumulate(&mut self, value: &Value, distinct: bool)

Accumulate a value into the aggregate

fn result(&self) -> Value

Get the final result

fn reset(&mut self)

Reset the aggregate state

fn clone_box(&self) -> Box<dyn AggregateFunction>

Clone the function into a new instance

fn configure(&mut self, _options: &[Value])

Configure the function with additional arguments

fn set_order_by(&mut self, _directions: Vec<bool>)

Configure ORDER BY for ordered-set aggregates like ARRAY_AGG, STRING_AGG

fn accumulate_with_sort_key( &mut self, value: &Value, sort_keys: Vec<Value>, distinct: bool, )

Accumulate a value with sort keys for ordered aggregates

fn supports_order_by(&self) -> bool

Check if this aggregate supports ORDER BY clause

impl Default for StddevSampFunction

fn default() -> StddevSampFunction

Returns the “default value” for a type.