Struct SchemaSpec 

pub struct SchemaSpec {
    pub name: Option<String>,
    pub columns: Vec<ColumnSpec>,
}

A named tabular signature (one input dataset, or the single output). name is optional for the output; required-and-distinct for multi-input transforms (validated in the manifest).

Fields

name: Option<String>

columns: Vec<ColumnSpec>

Implementations

impl SchemaSpec

pub fn new(columns: impl IntoIterator<Item = impl Into<ColumnSpec>>) -> Self

An unnamed signature from (name, type) pairs or ColumnSpecs.

use fv_compute::{FvType, SchemaSpec};
let sig = SchemaSpec::new([("id", FvType::Int64), ("amount", FvType::Float64)]);
assert!(sig.has_column("amount"));

pub fn named( name: impl Into<String>, columns: impl IntoIterator<Item = impl Into<ColumnSpec>>, ) -> Self

A named signature (required when a transform has more than one input).

pub fn to_arrow_schema(&self) -> Schema

Materialize as an Arrow Schema. All fields nullable=true (the plane is null-tolerant; tighter nullability is a refinement).

pub fn to_arrow_schema_ref(&self) -> Arc<Schema>

pub fn has_column(&self, name: &str) -> bool

Does this signature contain a column of the given name?

Trait Implementations

impl Clone for SchemaSpec

fn clone(&self) -> SchemaSpec

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SchemaSpec

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for SchemaSpec

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for SchemaSpec

impl PartialEq for SchemaSpec

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for SchemaSpec

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 SchemaSpec