Struct ColumnStats 

pub struct ColumnStats {
    pub null_frac: f32,
    pub n_distinct: u64,
    pub histogram_bounds: Vec<String>,
}

Per-column statistics computed by ANALYZE. See module docs.

Fields

null_frac: f32

Fraction of NULL rows. [0.0, 1.0].

n_distinct: u64

Raw distinct-value count (linear-counting estimate; PG stores a similar approximation. v6.2.x can re-tune the sketch — the value semantic is “approximate ≥ 0.95 accuracy on skewed corpora”).

histogram_bounds: Vec<String>

101 sorted bounds → 100 equi-depth buckets. Bucket i spans values in [bounds[i], bounds[i+1]) for i < 99, and [bounds[99], bounds[100]] for the final bucket. Bounds are the canonical SQL textual form of the column’s values — TEXT lexicographic, INT decimal, FLOAT shortest-round-trip, DATE/TIMESTAMP ISO. Empty for an all-NULL column.

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