StdDevFunction

sql_cli::sql::aggregates::functions

Struct StdDevFunction

pub struct StdDevFunction;

Expand description

STDDEV(column) - computes population standard deviation

Trait Implementations§

impl AggregateFunction for StdDevFunction

fn name(&self) -> &'static str

Name of the function (e.g., “SUM”, “AVG”)

fn init(&self) -> AggregateState

Initialize the aggregation state

fn accumulate( &self, state: &mut AggregateState, value: &DataValue, ) -> Result<()>

Add a value to the aggregation

fn finalize(&self, state: AggregateState) -> DataValue

Finalize and return the result

fn requires_numeric(&self) -> bool

Check if this function requires numeric input

Auto Trait Implementations§

impl Freeze for StdDevFunction

impl RefUnwindSafe for StdDevFunction

impl Send for StdDevFunction

impl Sync for StdDevFunction

impl Unpin for StdDevFunction

impl UnwindSafe for StdDevFunction

Blanket Implementations§

impl<T> Any for T
where T: 'static + ?Sized,

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impl<T> From<T> for T

fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

type Error = <U as TryFrom<T>>::Error

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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

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impl<V, T> VZip<V> for T
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