Enum RowDatasetVersionMeta 

pub enum RowDatasetVersionMeta {
    Inline(Arc<[u8]>),
    Column,
}

Metadata about the location of dataset version sequence data Following the same pattern as RowIdMeta

When stored inline, identical byte sequences are shared across fragments via Arc<[u8]> to reduce manifest memory for large tables.

Variants

Inline(Arc<[u8]>)

Small sequences stored inline in the fragment metadata

Column

The sequence is spilled to a hidden column of one of the fragment’s data files, one version per physical row in offset order, at ROW_CREATED_AT_VERSION_FIELD_ID or ROW_LAST_UPDATED_AT_VERSION_FIELD_ID depending on which sequence this is; see Fragment::row_lineage_file. Reading it needs IO, so it goes through the dataset’s loader rather than Self::load_sequence.

Implementations

impl RowDatasetVersionMeta

pub fn from_sequence(sequence: &RowDatasetVersionSequence) -> Result<Self>

Create inline metadata from a version sequence

pub fn load_sequence(&self) -> Result<RowDatasetVersionSequence>

Decode the version sequence stored inline in this metadata.

A sequence stored outside the manifest needs IO to read, which this synchronous accessor cannot do; it is an error here and is loaded through the dataset instead.

Trait Implementations

impl Clone for RowDatasetVersionMeta

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for RowDatasetVersionMeta

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

Formats the value using the given formatter.

impl DeepSizeOf for RowDatasetVersionMeta

fn deep_size_of_children(&self, __context: &mut Context) -> usize

fn deep_size_of(&self) -> usize

impl<'de> Deserialize<'de> for RowDatasetVersionMeta

fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error>

Deserialize this value from the given Serde deserializer.

impl Eq for RowDatasetVersionMeta

impl PartialEq for RowDatasetVersionMeta

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl Serialize for RowDatasetVersionMeta

fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error>

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for RowDatasetVersionMeta

impl TryFrom<CreatedAtVersionSequence> for RowDatasetVersionMeta

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: CreatedAtVersionSequence) -> Result<Self>

Performs the conversion.

impl TryFrom<LastUpdatedAtVersionSequence> for RowDatasetVersionMeta

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: LastUpdatedAtVersionSequence) -> Result<Self>

Performs the conversion.