Struct VariantType 

pub struct VariantType;

Arrow Variant ExtensionType.

Represents the canonical Arrow Extension Type for storing variants. See VariantArray in the parquet-variant-compute crate for more examples of using this extension type.

Trait Implementations

impl Clone for VariantType

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for VariantType

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

Formats the value using the given formatter.

impl ExtensionType for VariantType

const NAME: &'static str = "arrow.parquet.variant"

The name identifying this extension type.

type Metadata = &'static str

The metadata type of this extension type.

fn metadata(&self) -> &Self::Metadata

Returns a reference to the metadata of this extension type, or &() if if this extension type defines no metadata (Self::Metadata=()).

fn serialize_metadata(&self) -> Option<String>

Returns the serialized representation of the metadata of this extension type, or None if this extension type defines no metadata (Self::Metadata=()).

fn deserialize_metadata( _metadata: Option<&str>, ) -> Result<Self::Metadata, ArrowError>

Deserialize the metadata of this extension type from the serialized representation of the metadata. An extension type that defines no metadata should expect None for the serialized metadata and return Ok(()).

fn supports_data_type(&self, data_type: &DataType) -> Result<(), ArrowError>

Returns Ok(()) iff the given data type is supported by this extension type.

fn try_new( data_type: &DataType, _metadata: Self::Metadata, ) -> Result<Self, ArrowError>

Construct this extension type for a field with the given data type and metadata.

fn validate( data_type: &DataType, _metadata: Self::Metadata, ) -> Result<(), ArrowError>

Validate this extension type for a field with the given data type and metadata.

fn try_new_from_field_metadata( data_type: &DataType, metadata: &Metadata, ) -> Result<Self, ArrowError>

Construct this extension type from field metadata and data type.

impl From<VariantType> for CanonicalExtensionType

fn from(value: VariantType) -> Self

Converts to this type from the input type.

impl PartialEq for VariantType

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for VariantType