Struct ColumnStats 

pub struct ColumnStats {
    pub min_f64: Option<f64>,
    pub max_f64: Option<f64>,
    pub min_i64: Option<i64>,
    pub max_i64: Option<i64>,
    pub sorted_asc: bool,
    pub sorted_desc: bool,
    pub n_distinct: Option<usize>,
    pub n_null: usize,
    pub nrows: usize,
}

Statistical metadata for a single column.

Fields

min_f64: Option<f64>

Minimum value (for numeric columns)

max_f64: Option<f64>

Maximum value (for numeric columns)

min_i64: Option<i64>

Minimum value (for int columns)

max_i64: Option<i64>

Maximum value (for int columns)

sorted_asc: bool

Whether the column is sorted ascending

sorted_desc: bool

Whether the column is sorted descending

n_distinct: Option<usize>

Number of distinct values (exact for small columns, estimated for large)

n_null: usize

Number of null/NaN values

nrows: usize

Total number of rows

Implementations

impl ColumnStats

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

Compute stats for a column.

pub fn can_skip_gt(&self, threshold: f64) -> bool

Check if a filter col > threshold can be ruled out (all values <= threshold).

pub fn can_skip_lt(&self, threshold: f64) -> bool

Check if a filter col < threshold can be ruled out (all values >= threshold).

pub fn can_skip_ge(&self, threshold: f64) -> bool

Check if a filter col >= threshold can be ruled out (all values < threshold).

pub fn can_skip_le(&self, threshold: f64) -> bool

Check if a filter col <= threshold can be ruled out (all values > threshold).

pub fn can_skip_eq_f64(&self, value: f64) -> bool

Check if a filter col == value can be ruled out (value outside [min, max]).

pub fn can_skip_gt_i64(&self, threshold: i64) -> bool

Check if a filter col > threshold can be ruled out for int columns.

pub fn can_skip_lt_i64(&self, threshold: i64) -> bool

Check if a filter col < threshold can be ruled out for int columns.

pub fn can_skip_eq_i64(&self, value: i64) -> bool

Check if a filter col == value can be ruled out for int columns.

pub fn is_sorted(&self) -> bool

Check if column is sorted (ascending or descending).

pub fn binary_search_range_f64( col: &[f64], op: CompOp, threshold: f64, ) -> (usize, usize)

For a sorted ascending float column, find the row range satisfying a comparison predicate via binary search. Returns (start, end) where matching rows are start..end.

Caller must ensure the slice is actually sorted ascending.

pub fn binary_search_range_i64( col: &[i64], op: CompOp, threshold: i64, ) -> (usize, usize)

For a sorted ascending int column, find the row range satisfying a comparison predicate via binary search. Returns (start, end).

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.