uqa-storage 0.5.3

Document store, inverted index, IVF/HNSW vectors, B-tree, R*Tree, catalog
Documentation 
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//
// Unified Query Algebra
//
// Copyright (c) 2023-2026 Cognica, Inc.
//

//! Exact revision reads preserve private identities without scanning unrelated spilled keys.

use super::*;
use crate::mvcc::{DatabaseId, MemoryVersionStore, MergedRecordSnapshot};

const DATABASE: DatabaseId = DatabaseId::from_bytes([19; 16]);

#[test]
fn committed_revision_does_not_read_unrelated_private_spill_blocks() {
    for count in [32, 128] {
        let control = StorageReadControl::with_limit(512 << 10);
        let store = MemoryVersionStore::new(&MemoryBudget::new(1 << 20));
        let sequence = store
            .commit(
                &[RecordWrite {
                    key: b"catalog",
                    expected: None,
                    value: Some(b"definition"),
                }],
                &control,
            )
            .unwrap();
        let changes = PrivateRecordChanges::new(control.memory());
        let mut model = Model::new();
        for id in 0..count {
            stage(
                &changes,
                &mut model,
                id,
                Some("x".repeat(64 << 10)),
                &control,
            );
        }
        assert!(spilled_runs(&changes) > 0);
        let view = MergedRecordSnapshot::new(
            Arc::new(store.snapshot().unwrap()),
            changes.snapshot().unwrap(),
        );
        run::read_counts::take();
        let revision = view
            .record_revision(DATABASE, b"catalog", &control)
            .unwrap()
            .unwrap();
        assert_eq!(revision.committed(DATABASE), Some(sequence));
        assert!(!revision.is_private());
        assert!(view
            .record_revision(DATABASE, b"absent", &control)
            .unwrap()
            .is_none());
        let reads = run::read_counts::take();
        assert_eq!(
            reads.entries, 0,
            "a point miss must not open a range cursor"
        );
        assert_eq!(reads.blocks, 0);
        assert_eq!(reads.values, 0);
        drop((view, changes));
        assert_eq!(control.memory().used(), 0);
    }
}

#[test]
fn private_revision_point_reads_preserve_replacements_tombstones_and_undo() {
    let control = StorageReadControl::with_limit(512 << 10);
    let changes = PrivateRecordChanges::new(control.memory());
    let mut model = Model::new();
    for id in 0..32 {
        stage(
            &changes,
            &mut model,
            id,
            (id != 1).then(|| "x".repeat(64 << 10)),
            &control,
        );
    }
    assert!(spilled_runs(&changes) > 0);
    let store = MemoryVersionStore::new(&MemoryBudget::new(1 << 20));
    let committed = Arc::new(store.snapshot().unwrap());
    let capture = || MergedRecordSnapshot::new(committed.clone(), changes.snapshot().unwrap());
    let retained = capture();
    let read = StorageReadControl::with_limit(4 << 10);
    let revision =
        |view: &MergedRecordSnapshot, id| view.record_revision(DATABASE, &key(id), &read).unwrap();
    run::read_counts::take();
    let original = revision(&retained, 0).unwrap();
    let one_read = run::read_counts::take();
    assert!(one_read.entries > 0);
    assert_eq!(one_read.values, 0);
    retained.metadata(&key(0), &read).unwrap();
    assert_eq!(run::read_counts::take().entries, one_read.entries);
    assert!(original.is_private());
    assert_eq!(original.committed_sequence(), expected(0));
    assert!(revision(&retained, 1).is_none());
    assert!(revision(&retained, 31).unwrap().is_private());
    let savepoint = StorageSavepointId::allocate();
    changes.savepoint(savepoint).unwrap();
    stage(&changes, &mut model, 0, None, &control);
    stage(
        &changes,
        &mut model,
        1,
        Some("replacement".into()),
        &control,
    );
    let deleted = capture();
    assert!(revision(&deleted, 0).is_none());
    assert!(revision(&deleted, 1).unwrap().is_private());
    changes.rollback_to_savepoint(savepoint).unwrap();
    assert_eq!(revision(&capture(), 0), Some(original));
    stage(
        &changes,
        &mut model,
        0,
        Some("x".repeat(64 << 10)),
        &control,
    );
    let replaced = capture();
    assert_ne!(revision(&replaced, 0), Some(original));
    assert_eq!(revision(&retained, 0), Some(original));
    assert!(revision(&deleted, 0).is_none());
    assert_eq!(run::read_counts::take().values, 0);
    read.cancellation().cancel();
    assert!(replaced.record_revision(DATABASE, &key(0), &read).is_err());
    drop((replaced, retained, deleted, changes));
    assert_eq!(control.memory().used(), 0);
    assert_eq!(read.memory().used(), 0);
}