Struct mz_repr::RowColumnarEncoder

pub struct RowColumnarEncoder {
    encoders: Vec<DatumEncoder>,
    col_names: Vec<(usize, Arc<str>)>,
    nullability: BooleanBufferBuilder,
}

A ColumnEncoder for a Row.

Fields

encoders: Vec<DatumEncoder>

col_names: Vec<(usize, Arc<str>)>

nullability: BooleanBufferBuilder

Implementations

impl RowColumnarEncoder

pub fn new(desc: &RelationDesc) -> Option<Self>

Creates a RowColumnarEncoder for the provided RelationDesc.

Returns None if the provided RelationDesc has no columns.

Note

Internally we represent a Row as a StructArray which is required to have at least one field. Instead of handling this case by adding some special “internal” column we let a higher level encoder (e.g. SourceDataColumnarEncoder) handle this case.

Trait Implementations

impl ColumnEncoder<Row> for RowColumnarEncoder

type FinishedColumn = StructArray

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: &Row)

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 RowColumnarEncoder

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

Formats the value using the given formatter.