Enum delta_kernel::expressions::Scalar

pub enum Scalar {
    Integer(i32),
    Long(i64),
    Short(i16),
    Byte(i8),
    Float(f32),
    Double(f64),
    String(String),
    Boolean(bool),
    Timestamp(i64),
    TimestampNtz(i64),
    Date(i32),
    Binary(Vec<u8>),
    Decimal(i128, u8, u8),
    Null(DataType),
    Struct(StructData),
}

A single value, which can be null. Used for representing literal values in Expressions.

Variants

Integer(i32)

32bit integer

Long(i64)

64bit integer

Short(i16)

16bit integer

Byte(i8)

8bit integer

Float(f32)

32bit floating point

Double(f64)

64bit floating point

String(String)

utf-8 encoded string.

Boolean(bool)

true or false value

Timestamp(i64)

Microsecond precision timestamp, adjusted to UTC.

TimestampNtz(i64)

Microsecond precision timestamp, with no timezone.

Date(i32)

Date stored as a signed 32bit int days since UNIX epoch 1970-01-01

Binary(Vec<u8>)

Binary data

Decimal(i128, u8, u8)

Decimal value with a given precision and scale.

Null(DataType)

Null value with a given data type.

Struct(StructData)

Struct value

Implementations

impl Scalar

pub fn data_type(&self) -> DataType

pub fn is_null(&self) -> bool

Returns true if this scalar is null.

impl Scalar

pub fn to_array(&self, num_rows: usize) -> DeltaResult<ArrayRef>

Available on (crate features default-engine or sync-engine or arrow-conversion) and crate feature arrow-expression only.

Convert scalar to arrow array.

Trait Implementations

impl Clone for Scalar

fn clone(&self) -> Scalar

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Scalar

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

Formats the value using the given formatter.

impl Display for Scalar

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

Formats the value using the given formatter.

impl From<&str> for Scalar

fn from(s: &str) -> Self

Converts to this type from the input type.

impl From<String> for Scalar

fn from(value: String) -> Self

Converts to this type from the input type.

impl From<bool> for Scalar

fn from(b: bool) -> Self

Converts to this type from the input type.

impl From<i16> for Scalar

fn from(i: i16) -> Self

Converts to this type from the input type.

impl From<i32> for Scalar

fn from(i: i32) -> Self

Converts to this type from the input type.

impl From<i64> for Scalar

fn from(i: i64) -> Self

Converts to this type from the input type.

impl From<i8> for Scalar

fn from(i: i8) -> Self

Converts to this type from the input type.

impl PartialEq for Scalar

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

This method tests for self and other values to be equal, and is used by ==.

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

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for Scalar