Struct DecimalColumn 

pub struct DecimalColumn { /* private fields */ }

A column of exact decimals: Arrow Decimal128(precision, scale). Each value is a whole number (i128) and the column has one scale, so 1.25 at scale 2 is stored as 125. A gap is an Arrow null.

pond-ts has no decimal kind. pond-rs keeps decimals exact through count, first, last, min, max, keep, sum and difference; every other reducer works on the nearest f64 and gives a number column (or, for unique, top<N> and samples, a list of numbers).

Implementations

impl DecimalColumn

pub fn from_options( values: impl IntoIterator<Item = Option<i128>>, scale: i8, ) -> Result<Self>

Build from raw whole numbers at scale (None is a gap), with the widest precision, 38 digits. An error if a value has more than 38 digits or scale is outside -38..=38.

pub fn from_values(values: Vec<i128>, scale: i8) -> Result<Self>

DecimalColumn::from_options with no gaps.

pub fn len(&self) -> usize

Number of values.

pub fn is_empty(&self) -> bool

true when there are no values.

pub fn scale(&self) -> i8

Digits after the decimal point, the same for every row.

pub fn precision(&self) -> u8

The most digits a value may have (Arrow’s precision, at most 38).

pub fn get(&self, i: usize) -> Option<Decimal>

The value at i, or None for a gap. Panics if i is out of range.

pub fn iter(&self) -> impl Iterator<Item = Option<Decimal>> + '_

Iterate as Option<Decimal>.

pub fn missing_count(&self) -> usize

Number of gaps.

Trait Implementations

impl Clone for DecimalColumn

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 DecimalColumn

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

Formats the value using the given formatter.

impl From<DecimalColumn> for ColumnData

fn from(c: DecimalColumn) -> Self

Converts to this type from the input type.

impl PartialEq for DecimalColumn

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for DecimalColumn