Struct ApproxCountDistinctState 

pub struct ApproxCountDistinctState {
    pub approx_distinct_count: u64,
    pub total_count: u64,
}

State for the approximate count distinct analyzer.

Fields

approx_distinct_count: u64

Approximate count of distinct values.

total_count: u64

Total count of non-null values for calculating distinctness ratio.

Implementations

impl ApproxCountDistinctState

pub fn distinctness_ratio(&self) -> f64

Calculates the approximate distinctness ratio.

Trait Implementations

impl AnalyzerState for ApproxCountDistinctState

fn merge(states: Vec<Self>) -> AnalyzerResult<Self>

Merges multiple states into a single state.

fn is_empty(&self) -> bool

Returns whether this state represents an empty computation.

impl Clone for ApproxCountDistinctState

fn clone(&self) -> ApproxCountDistinctState

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ApproxCountDistinctState

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for ApproxCountDistinctState

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for ApproxCountDistinctState

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

where __S: Serializer,

Serialize this value into the given Serde serializer.