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

Generation number identifying this SSTable.

path: String

Directory name relative to the shard directory.

in_memory_bytes: Option<u64>

Payload size of the rows, as the writer’s MemTable accounted for them: the sum over its buffers of the window each one holds.

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.

Absent on an SSTable written before this field existed, so a reader must not read a missing value 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. A scan that applies the deletion vector yields fewer.

primary_key_bytes: Option<u64>

Total payload size of the primary-key columns, summed over every row in physical_rows. Not a per-row size: a variable-length key differs from row to row, and a consumer wanting a mean divides by the row count.

Accounted the same way as in_memory_bytes, so the same caveat applies – it is not the size of any encoded form of the key, such as a comparable byte-ordered encoding a reader might build for sorting or deduplication.

Absent also on a table with no primary key.

Implementations

impl SsTable

pub fn in_memory_bytes(&self) -> u64

Returns the value of in_memory_bytes, or the default value if in_memory_bytes is unset.

pub fn physical_rows(&self) -> u64

Returns the value of physical_rows, or the default value if physical_rows is unset.

pub fn primary_key_bytes(&self) -> u64

Returns the value of primary_key_bytes, or the default value if primary_key_bytes is unset.

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 Default for SsTable

fn default() -> Self

Returns the “default value” for a type.

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 Hash for SsTable

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Message for SsTable

fn encoded_len(&self) -> usize

Returns the encoded length of the message without a length delimiter.

fn clear(&mut self)

Clears the message, resetting all fields to their default.

fn encode(&self, buf: &mut impl BufMut) -> Result<(), EncodeError>

where Self: Sized,

Encodes the message to a buffer.

fn encode_to_vec(&self) -> Vec<u8>

where Self: Sized,

Encodes the message to a newly allocated buffer.

fn encode_length_delimited( &self, buf: &mut impl BufMut, ) -> Result<(), EncodeError>

where Self: Sized,

Encodes the message with a length-delimiter to a buffer.

fn encode_length_delimited_to_vec(&self) -> Vec<u8>

where Self: Sized,

Encodes the message with a length-delimiter to a newly allocated buffer.

fn decode(buf: impl Buf) -> Result<Self, DecodeError>

where Self: Default,

Decodes an instance of the message from a buffer.

fn decode_length_delimited(buf: impl Buf) -> Result<Self, DecodeError>

where Self: Default,

Decodes a length-delimited instance of the message from the buffer.

fn merge(&mut self, buf: impl Buf) -> Result<(), DecodeError>

where Self: Sized,

Decodes an instance of the message from a buffer, and merges it into self.

fn merge_length_delimited(&mut self, buf: impl Buf) -> Result<(), DecodeError>

where Self: Sized,

Decodes a length-delimited instance of the message from buffer, and merges it into self.

impl Name for SsTable

const NAME: &'static str = "SsTable"

Simple name for this Message. This name is the same as it appears in the source .proto file, e.g. FooBar.

const PACKAGE: &'static str = "lance.table"

Package name this message type is contained in. They are domain-like and delimited by ., e.g. google.protobuf.

fn full_name() -> String

Fully-qualified unique name for this Message. It’s prefixed with the package name and names of any parent messages, e.g. google.rpc.BadRequest.FieldViolation. By default, this is the package name followed by the message name. Fully-qualified names must be unique within a domain of Type URLs.

fn type_url() -> String

Type URL for this Message, which by default is the full name with a leading slash, but may also include a leading domain name, e.g. type.googleapis.com/google.profile.Person. This can be used when serializing into the google.protobuf.Any type.

impl PartialEq for SsTable

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for SsTable