Struct SsTable 

pub struct SsTable {
    pub generation: u64,
    pub path: String,
    pub in_memory_bytes: Option<u64>,
    pub physical_rows: Option<u64>,
    pub primary_key_bytes: Option<u64>,
}

An SSTable: the immutable result of flushing a MemTable, stored as a Lance dataset.

Fields

generation: u64

path: String

in_memory_bytes: Option<u64>

Payload size of the rows, as the writer’s MemTable accounted for them.

An estimate of the payload, not a bound on what reading the SSTable costs: it excludes the per-array structure a reader materializes, so a consumer budgeting memory from it must add its own headroom.

None on an SSTable written before these fields existed, which a reader must carry as unmeasured rather than as zero. The same applies to the two below.

physical_rows: Option<u64>

Rows held, counting the older duplicates of a primary key that the generation’s deletion vector masks.

primary_key_bytes: Option<u64>

Total payload size of the primary-key columns over every row in Self::physical_rows – not a per-row size, which varies for a variable-length key. Carries the same estimate caveat as Self::in_memory_bytes, and is also None on a table with no primary key.

Implementations

impl SsTable

pub fn unmeasured(generation: u64, path: String) -> Self

An SSTable whose contents were not measured at flush.

Trait Implementations

impl Clone for SsTable

fn clone(&self) -> SsTable

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SsTable

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

Formats the value using the given formatter.

impl DeepSizeOf for SsTable

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

fn deep_size_of(&self) -> usize

impl<'de> Deserialize<'de> for SsTable

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for SsTable

impl From<&SsTable> for SsTable

fn from(sstable: &SsTable) -> Self

Converts to this type from the input type.

impl From<SsTable> for SsTable

fn from(sstable: SsTable) -> Self

Converts to this type from the input type.

impl PartialEq for SsTable

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for SsTable

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for SsTable