Struct UnitColumnar

pub struct UnitColumnar {
    len: usize,
}

An encoder and decoder for UnitSchema.

Fields

len: usize

Number of entries in this column.

Implementations

impl UnitColumnar

pub fn new(len: usize) -> Self

Returns a new UnitColumnar with the number of entries specified.

Trait Implementations

impl ColumnDecoder<()> for UnitColumnar

fn decode(&self, idx: usize, _val: &mut ())

Decode the value at idx into the buffer val.

fn is_null(&self, idx: usize) -> bool

Returns if the value at idx is null.

fn stats(&self) -> StructStats

Returns statistics for the column. This structure is defined by Persist, but the contents are determined by the client; Persist will preserve them in the part metadata and make them available to readers.

impl ColumnEncoder<()> for UnitColumnar

type FinishedColumn = NullArray

Type of column that this encoder returns when finalized.

fn goodbytes(&self) -> usize

The amount of “actual data” encoded by this encoder so far.

fn append(&mut self, _val: &())

Appends val onto this encoder.

fn append_null(&mut self)

Appends a null value onto this encoder.

fn finish(self) -> Self::FinishedColumn

Finish this encoder, returning an immutable column.

impl Debug for UnitColumnar

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

Formats the value using the given formatter.