Struct CatalogSnapshot 

pub struct CatalogSnapshot {
    pub tables: BTreeMap<Symbol, CatalogTableSpec>,
    pub rows: BTreeMap<Symbol, BTreeMap<Symbol, CatalogSnapshotRow>>,
    pub sequences: BTreeMap<Symbol, u64>,
    pub epoch: u64,
}

A deterministic, point-in-time copy of a CatalogStore’s data.

Snapshots carry table specs, row data, sequences, and the catalog epoch. Live host payloads (runtime values, tests) are not serialized; their fields become catalog/unresolved-live markers. See the README section “Snapshots and deltas”.

Examples

let store = CatalogStore::new();
let snapshot = CatalogSnapshot::from_store(&store);
// Snapshots round-trip through a deterministic Expr form.
let restored = CatalogSnapshot::from_expr(snapshot.to_expr()).unwrap();
assert_eq!(restored, snapshot);

Fields

tables: BTreeMap<Symbol, CatalogTableSpec>

Installed table specs by name.

rows: BTreeMap<Symbol, BTreeMap<Symbol, CatalogSnapshotRow>>

Snapshot rows by table and key.

sequences: BTreeMap<Symbol, u64>

Sequence values by name.

epoch: u64

Catalog epoch the snapshot was taken at.

Implementations

impl CatalogSnapshot

pub fn from_store(store: &CatalogStore) -> Self

Captures the visible data of store, replacing live payloads with unresolved-live markers.

pub fn to_expr(&self) -> Expr

Emits the deterministic Expr encoding of the snapshot.

pub fn from_expr(expr: Expr) -> Result<Self>

Parses a snapshot from the Expr shape produced by Self::to_expr.

pub fn rows( &self, table: &Symbol, ) -> Option<&BTreeMap<Symbol, CatalogSnapshotRow>>

Returns the snapshot rows of table by key, if any.

Trait Implementations

impl Clone for CatalogSnapshot

fn clone(&self) -> CatalogSnapshot

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CatalogSnapshot

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

Formats the value using the given formatter.

impl Eq for CatalogSnapshot

impl PartialEq for CatalogSnapshot

fn eq(&self, other: &CatalogSnapshot) -> 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 CatalogSnapshot