Enum TransformStep 

pub enum TransformStep {
    Select {
        columns: Vec<String>,
    },
    Drop {
        columns: Vec<String>,
    },
    Rename {
        pairs: Vec<(String, String)>,
    },
    Cast {
        column: String,
        to: DataType,
        mode: CastMode,
    },
    FillNull {
        column: String,
        value: Value,
    },
    WithLiteral {
        name: String,
        value: Value,
    },
    DeriveMulF64 {
        name: String,
        source: String,
        factor: f64,
    },
    DeriveAddF64 {
        name: String,
        source: String,
        delta: f64,
    },
}

A transformation step in a TransformSpec.

Variants

Select

Select/reorder columns (in the provided order).

Fields

columns: Vec<String>

Drop

Drop columns.

Fields

columns: Vec<String>

Rename

Rename columns (strict: source columns must exist).

Fields

pairs: Vec<(String, String)>

Cast

Cast a column to a target type.

Fields

column: String

to: DataType

mode: CastMode

FillNull

Fill nulls in a column with a literal.

Fields

column: String

value: Value

WithLiteral

Add a derived column with a literal value.

Fields

name: String

value: Value

DeriveMulF64

Add a derived Float64 column: name = source * factor (nulls propagate).

Fields

name: String

source: String

factor: f64

DeriveAddF64

Add a derived Float64 column: name = source + delta (nulls propagate).

Fields

name: String

source: String

delta: f64

Trait Implementations

impl Clone for TransformStep

fn clone(&self) -> TransformStep

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TransformStep

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for TransformStep

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for TransformStep

fn eq(&self, other: &TransformStep) -> 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 Serialize for TransformStep

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for TransformStep