Struct ColumnStatistics

pub struct ColumnStatistics {
    pub null_count: Precision<usize>,
    pub max_value: Precision<ScalarValue>,
    pub min_value: Precision<ScalarValue>,
    pub distinct_count: Precision<usize>,
}

Statistics for a column within a relation

Fields

null_count: Precision<usize>

Number of null values on column

max_value: Precision<ScalarValue>

Maximum value of column

min_value: Precision<ScalarValue>

Minimum value of column

distinct_count: Precision<usize>

Number of distinct values

Implementations

impl ColumnStatistics

pub fn is_singleton(&self) -> bool

Column contains a single non null value (e.g constant).

pub fn new_unknown() -> Self

Returns a ColumnStatistics instance having all Precision::Absent parameters.

pub fn to_inexact(self) -> Self

If the exactness of a ColumnStatistics instance is lost, this function relaxes the exactness of all information by converting them Precision::Inexact.

Trait Implementations

impl Clone for ColumnStatistics

fn clone(&self) -> ColumnStatistics

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for ColumnStatistics

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

Formats the value using the given formatter.

impl Default for ColumnStatistics

fn default() -> ColumnStatistics

Returns the “default value” for a type.

impl PartialEq for ColumnStatistics

fn eq(&self, other: &ColumnStatistics) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for ColumnStatistics

impl StructuralPartialEq for ColumnStatistics