Enum SupportedPrecision 

pub(crate) enum SupportedPrecision {
    Seconds,
    Milliseconds,
    Microseconds,
    Nanoseconds,
    Picoseconds,
}

A sub-second precision that names a unit: the decimal exponent Substrait stores, and the duration suffix that writes it.

Substrait allows any precision from 0 to 12 on a type, but a literal value has to be written down, and only these five have a unit to write it in. Constructing a SupportedPrecision checks that once, so code holding one can convert without re-checking.

Not every literal supports every variant: chrono-backed literals (timestamp, time) top out at nanoseconds, so they reject Picoseconds.

Variants

Seconds

Milliseconds

Microseconds

Nanoseconds

Picoseconds

Implementations

impl SupportedPrecision

pub fn units(self) -> i32

The Substrait precision unit exponent (0, 3, 6, 9, or 12).

pub fn from_units(units: i32) -> Option<Self>

Returns None for a precision with no unit to write it in.

pub fn subsecond_unit(self) -> Option<&'static str>

The duration-string suffix for sub-seconds at this precision.

Seconds has none: at precision 0 there is no sub-second component.

pub fn from_subsecond_unit(unit: &str) -> Option<Self>

The precision implied by a duration-string sub-second suffix.

Trait Implementations

impl Clone for SupportedPrecision

fn clone(&self) -> SupportedPrecision

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SupportedPrecision

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

Formats the value using the given formatter.

impl Display for SupportedPrecision

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

Formats the value using the given formatter.

impl Ord for SupportedPrecision

fn cmp(&self, other: &SupportedPrecision) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for SupportedPrecision

fn eq(&self, other: &SupportedPrecision) -> 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 PartialOrd for SupportedPrecision

fn partial_cmp(&self, other: &SupportedPrecision) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Copy for SupportedPrecision

impl Eq for SupportedPrecision

impl StructuralPartialEq for SupportedPrecision