VarPopFunction

sql_cli::sql::aggregates::functions

Struct VarPopFunction

pub struct VarPopFunction;

Expand description

VAR_POP(column) - computes population variance (same as VARIANCE)

Trait Implementations§

impl AggregateFunction for VarPopFunction

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 VarPopFunction

impl RefUnwindSafe for VarPopFunction

impl Send for VarPopFunction

impl Sync for VarPopFunction

impl Unpin for VarPopFunction

impl UnwindSafe for VarPopFunction

Blanket Implementations§

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

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Gets the TypeId of self. Read more

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where T: ?Sized,

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impl<T> From<T> for T

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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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impl<T> ErasedDestructor for T
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