Struct ColumnStats 

pub struct ColumnStats {
    pub name: String,
    pub count: usize,
    pub null_count: usize,
    pub min: Option<f64>,
    pub max: Option<f64>,
    pub sum: Option<f64>,
    pub distinct_count: Option<usize>,
}

Statistics for a single column

Fields

name: String

Column name

count: usize

Number of values

null_count: usize

Number of null/missing values (always 0 for now, extensible)

min: Option<f64>

Minimum value (as f64, NaN for non-numeric)

max: Option<f64>

Maximum value (as f64, NaN for non-numeric)

sum: Option<f64>

Sum of values (for numeric columns)

distinct_count: Option<usize>

Number of distinct values

Implementations

impl ColumnStats

pub fn from_column(col: &Column) -> Self

Compute statistics for a column

pub fn could_contain_value(&self, value: f64) -> bool

Check if a numeric value could exist in this column based on min/max

Trait Implementations

impl Clone for ColumnStats

fn clone(&self) -> ColumnStats

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ColumnStats

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

Formats the value using the given formatter.

impl PartialEq for ColumnStats

fn eq(&self, other: &ColumnStats) -> 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 StructuralPartialEq for ColumnStats