Struct mz_repr::RowColumnarDecoder

pub struct RowColumnarDecoder {
    len: usize,
    decoders: Vec<(Arc<str>, Option<usize>, DatumColumnDecoder)>,
    nullability: Option<NullBuffer>,
}

A ColumnDecoder for a Row.

Fields

len: usize

The length of all columns in this decoder; matching all child arrays and the null array if present.

decoders: Vec<(Arc<str>, Option<usize>, DatumColumnDecoder)>

Field-specific information: the user-readable field name, the null count (or None if the column is non-nullable), and the decoder which wraps the column-specific array.

nullability: Option<NullBuffer>

The null buffer for this row, if present. (At time of writing, all rows are assumed to be logically nullable.)

Implementations

impl RowColumnarDecoder

pub fn new(col: StructArray, desc: &RelationDesc) -> Result<Self, Error>

Creates a RowColumnarDecoder that decodes from the provided StructArray.

Returns an error if the schema of the StructArray does not match the provided RelationDesc.

pub fn null_count(&self) -> usize

Trait Implementations

impl ColumnDecoder<Row> for RowColumnarDecoder

fn decode(&self, idx: usize, val: &mut Row)

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 Debug for RowColumnarDecoder

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

Formats the value using the given formatter.