Struct VariantType 

pub struct VariantType;

Arrow Variant [ExtensionType].

Represents the canonical Arrow Extension Type for storing variants. See VariantArray for more examples of using this extension type.

Trait Implementations

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) -> &<VariantType as ExtensionType>::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<<VariantType as ExtensionType>::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: <VariantType as ExtensionType>::Metadata, ) -> Result<VariantType, ArrowError>

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