Struct SnapshotContext 

pub struct SnapshotContext {
    pub snapshot: Snapshot,
    pub manager: Arc<SnapshotManager>,
    pub own_xids: HashSet<u64>,
    pub requires_index_fallback: bool,
}

Snapshot + manager pair used for read-path visibility checks.

The manager is needed in addition to the snapshot because aborted state mutates after the snapshot is captured — a ROLLBACK by a committed-at-capture-time writer must still hide its tuples. Keeping the Arc around is O(pointer) and the RwLock reads on is_aborted are cheap (HashSet lookup under a parking_lot read guard).

own_xids (Phase 2.3.2e) lists the xids belonging to the current connection’s transaction — the parent xid plus open and released savepoint sub-xids. The visibility rule promotes rows stamped with these xids to “always visible (unless aborted)” so the writer sees its own nested-savepoint writes even though their xids exceed snapshot.xid.

Fields

snapshot: Snapshot

manager: Arc<SnapshotManager>

own_xids: HashSet<u64>

requires_index_fallback: bool

Trait Implementations

impl Clone for SnapshotContext

fn clone(&self) -> SnapshotContext

Returns a duplicate of the value.

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

Performs copy-assignment from source.