Struct CatalogCacheRevisions 

pub struct CatalogCacheRevisions {
    pub table_catalog: u64,
    pub registries: u64,
    pub graphs: Option<BTreeMap<String, u64>>,
    pub table_data: BTreeMap<String, u64>,
    pub table_data_commits: BTreeMap<String, (DatabaseId, CommitSequence)>,
    pub column_statistics: BTreeMap<String, u64>,
    pub statistics_maintenance: BTreeMap<String, u64>,
    pub storage_schema: u64,
}

Lightweight generations read from the same storage snapshot as catalog and row data. Providers must advance them atomically with the corresponding mutation, including direct storage writes, and restore them on rollback. Missing support is distinct from an empty, unchanged database. Generations are opaque equality tokens, not clocks or counts. A logical provider may use the domain at or above Self::PRIVATE_GENERATION_BASE for transaction-private changes; rollback restores the prior tokens and commit replaces them with durable generations.

Fields

table_catalog: u64

registries: u64

graphs: Option<BTreeMap<String, u64>>

Per-graph generations, separate from SQL registries. None preserves conservative restoration for providers without graph-scoped tracking.

table_data: BTreeMap<String, u64>

table_data_commits: BTreeMap<String, (DatabaseId, CommitSequence)>

Last committed change of each table’s data generation on this snapshot, even when its visible generation is private. An absent entry supplies no certificate. The database and sequence let a reader recognize data it already observed, including its own commit adopted without catalog reads.

column_statistics: BTreeMap<String, u64>

statistics_maintenance: BTreeMap<String, u64>

storage_schema: u64

Physical schema changes also invalidate bindings, even when a caller changed the storage schema without an ordinary catalog operation.

Implementations

impl CatalogCacheRevisions

pub const PRIVATE_GENERATION_BASE: u64

The first generation of the domain reserved for changes private to the reading transaction. Durable generations stay below it.

pub fn is_private_generation(generation: u64) -> bool

Whether generation identifies a change private to the reading transaction instead of a committed generation.

Trait Implementations

impl Clone for CatalogCacheRevisions

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CatalogCacheRevisions

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

Formats the value using the given formatter.

impl Default for CatalogCacheRevisions

fn default() -> Self

Returns the “default value” for a type.

impl Eq for CatalogCacheRevisions

impl PartialEq for CatalogCacheRevisions

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for CatalogCacheRevisions