Struct ColumnSurvey 

pub struct ColumnSurvey {

    pub name: String,
    pub declared_type: Option<String>,
    pub affinity: Affinity,
    pub nulls: u64,
    pub integers: u64,
    pub reals: u64,
    pub texts: u64,
    pub blobs: u64,
    pub missing: u64,
    pub largest_integer: u64,
    pub longest_value: usize,
    pub is_rowid_alias: bool,
    pub is_virtual: bool,
}

What one column turned out to hold.

Fields

name: String

declared_type: Option<String>

affinity: Affinity

nulls: u64

Rows per logical storage class, affinity already applied.

integers: u64

reals: u64

texts: u64

blobs: u64

missing: u64

Rows whose record ended before this column, which take its default.

largest_integer: u64

The largest integer seen, by magnitude. A column that mixes integers and reals can only become a float if every integer in it survives the trip, and past 2^53 they stop doing that.

longest_value: usize

Bytes in the longest text or blob seen. A key or an index has a length limit, so a caller deciding what to make of this column needs to know its worst case before it starts writing rather than after.

is_rowid_alias: bool

is_virtual: bool

Implementations

impl ColumnSurvey

pub fn classes(&self) -> Vec<StorageClass>

The classes actually present, ignoring nulls, which are a question about nullability rather than about type.

pub fn has_nulls(&self) -> bool

Trait Implementations

impl Clone for ColumnSurvey

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ColumnSurvey

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

Formats the value using the given formatter.

impl Eq for ColumnSurvey

impl PartialEq for ColumnSurvey

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for ColumnSurvey