Struct Null 

pub struct Null;

Marker type for Arrow DataType::Null columns.

A Null column contains only nulls. Appending a value or a null both append a null slot. This maps to arrow_array::NullArray and uses NullBuilder.

Trait Implementations

impl ArrowBinding for Null

type Builder = NullBuilder

Concrete Arrow builder type used for this Rust type.

type Array = NullArray

Concrete Arrow array type produced by finish.

fn data_type() -> DataType

The Arrow DataType corresponding to this Rust type.

fn new_builder(_capacity: usize) -> Self::Builder

Create a new builder with an optional capacity hint.

fn append_value(b: &mut Self::Builder, _v: &Self)

Append a non-null value to the builder.

fn append_null(b: &mut Self::Builder)

Append a null to the builder.

fn finish(b: Self::Builder) -> Self::Array

Finish the builder and produce a typed Arrow array.

fn estimated_bytes_per_value() -> usize

Estimated bytes per value for variable-length types (String, Binary, etc.). Returns 0 for fixed-size types. Used to pre-allocate buffer space.