Struct Metadata

pub struct Metadata {
    pub batch_offsets: Vec<i32>,
    pub page_table_position: usize,
    pub manifest_position: Option<usize>,
    pub stats_metadata: Option<StatisticsMetadata>,
}

Data File Metadata

Fields

batch_offsets: Vec<i32>

Offset of each record batch.

page_table_position: usize

The file position of the page table in the file.

manifest_position: Option<usize>

The file position of the manifest block in the file.

stats_metadata: Option<StatisticsMetadata>

Metadata about statistics.

Implementations

impl Metadata

pub fn num_batches(&self) -> usize

Get the number of batches in this file.

pub fn len(&self) -> usize

Get the number of records in this file

pub fn is_empty(&self) -> bool

pub fn push_batch_length(&mut self, batch_len: i32)

Push the length of the batch.

pub fn get_offset(&self, batch_id: i32) -> Option<i32>

Get the starting offset of the batch.

pub fn get_batch_length(&self, batch_id: i32) -> Option<i32>

Get the length of the batch.

pub fn group_indices_to_batches(&self, indices: &[u32]) -> Vec<BatchOffsets>

Group row indices into each batch.

The indices must be sorted.

pub fn range_to_batches( &self, range: Range<usize>, ) -> Result<Vec<(i32, Range<usize>)>>

Map the range of row indices to the corresponding batches.

It returns a list of (batch_id, in_batch_range) tuples.

Trait Implementations

impl Debug for Metadata

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

Formats the value using the given formatter.

impl DeepSizeOf for Metadata

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

Returns an estimation of the heap-managed storage of this object. This does not include the size of the object itself.

fn deep_size_of(&self) -> usize

Returns an estimation of a total size of memory owned by the object, including heap-managed storage.

impl Default for Metadata

fn default() -> Metadata

Returns the “default value” for a type.

impl From<&Metadata> for Metadata

fn from(m: &Metadata) -> Self

Converts to this type from the input type.

impl PartialEq for Metadata

fn eq(&self, other: &Metadata) -> 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 ProtoStruct for Metadata

type Proto = Metadata

impl TryFrom<Metadata> for Metadata

type Error = Error

The type returned in the event of a conversion error.

fn try_from(m: Metadata) -> Result<Self>

Performs the conversion.

impl StructuralPartialEq for Metadata