Struct RowNumber 

pub struct RowNumber;

The extension type for row numbers.

Extension name: parquet.virtual.row_number.

This virtual column has storage type Int64 and uses empty string metadata.

Trait Implementations

impl Clone for RowNumber

fn clone(&self) -> RowNumber

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for RowNumber

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

Formats the value using the given formatter.

impl Default for RowNumber

fn default() -> RowNumber

Returns the “default value” for a type.

impl ExtensionType for RowNumber

const NAME: &'static str = "parquet.virtual.row_number"

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.

impl PartialEq for RowNumber

fn eq(&self, other: &RowNumber) -> 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 Copy for RowNumber

impl StructuralPartialEq for RowNumber