Struct ColumnStats 

pub struct ColumnStats {

    pub name: String,
    pub count: usize,
    pub unique_count: usize,
    pub null_count: usize,
    pub all_integers: bool,
    pub all_numeric: bool,
    pub min_str_len: Option<usize>,
    pub max_str_len: Option<usize>,
    pub avg_str_len: Option<f32>,
    pub looks_like_datetime: bool,
    pub is_array: bool,
    pub array_len: Option<usize>,
    pub sample_values: Vec<String>,
}

Statistics about a column used for type inference

Fields

name: String

Column name

count: usize

Number of rows

unique_count: usize

Number of unique values

null_count: usize

Number of null/missing values

all_integers: bool

Whether all values are integers

all_numeric: bool

Whether all values are numeric

min_str_len: Option<usize>

Minimum string length (if text)

max_str_len: Option<usize>

Maximum string length (if text)

avg_str_len: Option<f32>

Average string length (if text)

looks_like_datetime: bool

Whether values look like timestamps

is_array: bool

Whether values are arrays/lists

array_len: Option<usize>

Array element count (if array)

sample_values: Vec<String>

Sample values for heuristic analysis

Implementations

impl ColumnStats

pub fn new(name: impl Into<String>) -> Self

Create stats for a column

pub fn cardinality_ratio(&self) -> f32

Cardinality ratio: unique_count / count

pub fn null_ratio(&self) -> f32

Null ratio: null_count / count

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 Default for ColumnStats

fn default() -> ColumnStats

Returns the “default value” for a type.