Struct Statistics 

pub struct Statistics { /* private fields */ }

Implementations

impl Statistics

pub fn new() -> Self

pub fn len(&self) -> usize

pub fn is_empty(&self) -> bool

pub fn get(&self, table: &str, column: &str) -> Option<&ColumnStats>

pub fn iter(&self) -> impl Iterator<Item = (&(String, String), &ColumnStats)>

Iterate ((table, column), stats) in deterministic alphabetical order. Used by SELECT * FROM spg_statistic and by snapshot serialisation.

pub fn set(&mut self, table: String, column: String, stats: ColumnStats)

Replace (or insert) the stats for one (table, column). Called by ANALYZE per column.

pub fn clear_table(&mut self, table: &str)

Drop every row whose table key matches table. Called before re-ANALYZE on a table so columns dropped between analyses don’t leave stale rows behind.

pub fn reset_modified(&mut self, table: &str)

Reset the modified-row counter for table. Called at the end of ANALYZE so v6.2.1 auto-analyze starts a fresh window.

pub fn record_modifications(&mut self, table: &str, n: u64)

Bump the modified-row counter. The engine’s exec_insert / exec_update / exec_delete paths feed this hook so v6.2.1 auto-analyze can read it.

pub fn modified_since_last_analyze(&self, table: &str) -> u64

pub fn version(&self) -> u64

v6.3.1 — current monotonic version. Plan cache snapshots this at prepare time; lookup compares and evicts on mismatch.

pub fn bump_version(&mut self)

v6.3.1 — bumps the version. Called by exec_analyze after a successful ANALYZE on any table.

pub fn serialize(&self) -> Vec<u8>

Format (each block little-endian): [u16 num_columns] for each column: [u16 table_len][table bytes] [u16 col_len][col bytes] [f32 null_frac] [u64 n_distinct] [u16 num_bounds] for each bound: [u16 b_len][b bytes] [u16 num_modified_entries] for each: [u16 t_len][t bytes][u64 modified_count]

pub fn deserialize(buf: &[u8]) -> Result<Self, StatisticsError>

Trait Implementations

impl Clone for Statistics

fn clone(&self) -> Statistics

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Statistics

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

Formats the value using the given formatter.

impl Default for Statistics

fn default() -> Statistics

Returns the “default value” for a type.

impl PartialEq for Statistics

fn eq(&self, other: &Statistics) -> 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 StructuralPartialEq for Statistics