Struct polars_arrow::datatypes::ArrowSchema

pub struct ArrowSchema {
    pub fields: Vec<Field>,
    pub metadata: Metadata,
}

An ordered sequence of Fields with associated Metadata.

ArrowSchema is an abstraction used to read from, and write to, Arrow IPC format, Apache Parquet, and Apache Avro. All these formats have a concept of a schema with fields and metadata.

Fields

fields: Vec<Field>

The fields composing this schema.

metadata: Metadata

Optional metadata.

Implementations

impl ArrowSchema

pub fn with_metadata(self, metadata: Metadata) -> Self

Attaches a Metadata to ArrowSchema

pub fn len(&self) -> usize

pub fn is_empty(&self) -> bool

pub fn filter<F: Fn(usize, &Field) -> bool>(self, predicate: F) -> Self

Returns a new ArrowSchema with a subset of all fields whose predicate evaluates to true.

pub fn try_project(&self, indices: &[usize]) -> PolarsResult<Self>

Trait Implementations

impl Clone for ArrowSchema

fn clone(&self) -> ArrowSchema

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for ArrowSchema

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

Formats the value using the given formatter.

impl Default for ArrowSchema

fn default() -> ArrowSchema

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for ArrowSchema

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl From<Vec<Field>> for ArrowSchema

fn from(fields: Vec<Field>) -> Self

Converts to this type from the input type.

impl PartialEq for ArrowSchema

fn eq(&self, other: &ArrowSchema) -> 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 ArrowSchema

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Eq for ArrowSchema

impl StructuralPartialEq for ArrowSchema