Struct ValueBuilder 

pub struct ValueBuilder(/* private fields */);

Wrapper around a Vec<u8> that provides methods for appending primitive values, variant types, and metadata.

This is used internally by the builders to construct the the value field for Variant values.

You can reuse an existing Vec<u8> by using the from impl

Implementations

impl ValueBuilder

pub fn new() -> Self

Construct a ValueBuffer that will write to a new underlying Vec

impl ValueBuilder

pub fn into_inner(self) -> Vec<u8>

Returns the underlying buffer, consuming self

pub fn offset(&self) -> usize

Returns the current size of the underlying buffer

pub fn append_variant<S: BuilderSpecificState>( state: ParentState<'_, S>, variant: Variant<'_, '_>, )

Appends a variant to the builder.

Panics

This method will panic if the variant contains duplicate field names in objects when validation is enabled. For a fallible version, use ValueBuilder::try_append_variant

pub fn try_append_variant<S: BuilderSpecificState>( state: ParentState<'_, S>, variant: Variant<'_, '_>, ) -> Result<(), ArrowError>

Tries to append a variant to the provided ParentState instance.

The attempt fails if the variant contains duplicate field names in objects when validation is enabled.

pub fn append_variant_bytes<S: BuilderSpecificState>( state: ParentState<'_, S>, variant: Variant<'_, '_>, )

Appends a variant to the buffer by copying raw bytes when possible.

For objects and lists, this directly copies their underlying byte representation instead of performing a logical copy and without touching the metadata builder. For other variant types, this falls back to the standard append behavior.

The caller must ensure that the metadata dictionary is already built and correct for any objects or lists being appended.

Trait Implementations

impl Debug for ValueBuilder

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

Formats the value using the given formatter.

impl Default for ValueBuilder

fn default() -> ValueBuilder

Returns the “default value” for a type.