perf(db): speed up many small filtered live queries - #1956
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…kip abort machinery for eager subset demand Adds a WHERE three-valued logic oracle. A mutant that returned FALSE for eq(string, null) survived the existing oracle campaign; the new owner kills it. Co-authored-by: Isaac <no-reply@databricks.com>
…atch A subscription whose where clause has a top-level eq(field, string|boolean) conjunct skips a source batch when neither the value nor the previous value of any change can satisfy that conjunct. Stale published rows, truncate replay, and empty ready batches keep the full path. Extends the WHERE oracle into a publication oracle: change histories with multi-key transactions, Date and NaN operands, and three subscriber routes. Hostile mutants for or-routing, number-literal routing, move-out, ready, and stale-row reconciliation passed the existing suite and fail here. Co-authored-by: Isaac <no-reply@databricks.com>
…changeset Align the oracle's vocabulary with the glossary and list its limits and open cleanup/restart histories in the coverage map. Co-authored-by: Isaac <no-reply@databricks.com>
Co-authored-by: Isaac <no-reply@databricks.com>
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Included review availability: This review used your included allowance. Your plan provides up to 8 included reviews per hour; 2 remain after this review. 📝 WalkthroughWalkthroughThe changes add equality prefilters for collection snapshots and subscriptions, and adjust query compilation to skip selected materialization work. A property-based oracle checks filtered publication against an independent model. Query runtime records and ChangesQuery performance and publication validation
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~30 minutes Change: Refactor Suggested reviewers: Merge Risk: ⚪ Minimal · up to This change speeds up filtered live queries and adds publication tests. No merge-blocking issue was identified in the supplied review material. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to The examined paths preserve full predicate checks, row visibility, and stale-run protections. No introduced security flaw was established, but coverage of all exported consumers and application-level isolation is incomplete. Retained concerns Security review detailsSecurity Blast Radius
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Review comments at @packages/db/src/collection/subscription.ts:
- Around line 1151-1153: Update the `cannotMatchAny` filtering predicate to let
deletes whose keys are in `sentKeys` proceed to `filterAndFlipChanges`, so their
bookkeeping removes those keys; preserve the existing prefilter checks for other
changes.
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.changeset/perf-many-filtered-live-queries.mddocs/contributing/oracle-coverage.mdpackages/db/package.jsonpackages/db/src/collection/change-events.tspackages/db/src/collection/subscription.tspackages/db/src/query/compiler/evaluators.tspackages/db/tests/oracle-config.tspackages/db/tests/query/where-predicate-publication-oracle.property.test.ts
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A filtered subscription records every unsent inserted key, including rows its where clause then drops. Skipping a batch that deletes such a key left the record behind, so a later matching reinsertion was treated as a duplicate insert and never published. Deletes of tracked keys now take the full path. The WHERE publication oracle now reinserts previously deleted keys, favors prefilterable predicates and boundary-crossing values in change histories, and pins the reported sequence. Co-authored-by: Isaac <no-reply@databricks.com>
values() built a new generator function and bound it on every call. Collection state iterates its transaction map this way several times per sync commit, so every live-query result commit paid for it. A generator method yields the same lazy sequence. Indexed mount of 240 filtered live queries drops from 6.3 to 5.4 ms per switch. Co-authored-by: Isaac <no-reply@databricks.com>
Source ids are unique per reference, so each compiled query created plain objects whose keys V8 had never seen, adding a hidden-class transition per key. Records keyed by source id now have no prototype. Indexed mount of 240 filtered live queries drops about 5%. Co-authored-by: Isaac <no-reply@databricks.com>
The includes rebuild canonicalized every non-aggregate query's rows through a keyed reduce and ran every result through the bucket facade adapter. A query over one Collection with no joins, grouping, DISTINCT, ordering, includes, or parent route has one contribution per key and no facade references, so it now publishes its compiled pipeline directly, as ARCHITECTURE.md requires. With 240 filtered live queries, indexed mount drops from 5.5 to 3.5 ms per switch and a 50-row update batch from 1.3 to 0.84 ms. Co-authored-by: Isaac <no-reply@databricks.com>
An unindexed filtered snapshot copied every visible row to add virtual properties before evaluating the predicate. When the predicate has a top-level eq(field, string|boolean) conjunct on a non-virtual field, the scan now tests that field on the stored row first and enriches only the survivors, which still pass through the full predicate. Without optimistic state it iterates the synced rows directly. With 240 unindexed filtered live queries, mount drops from 13.5 to 8.1 ms per switch. The index-tracking test helpers count the new scan as a full scan, and the WHERE publication oracle now pins an optimistic row that the scan must include. Co-authored-by: Isaac <no-reply@databricks.com>
…ve-queries # Conflicts: # docs/contributing/oracle-coverage.md # packages/db/src/SortedMap.ts
Co-authored-by: Isaac <no-reply@databricks.com>
filterAndFlipChanges added every unsent inserted or updated key to sentKeys before the where clause ran, so rows the filter dropped still counted as sent. For an ordered, limited subscription that inflated the next page's loadSubset offset and skipped rows. With the batch prefilter, whether a dropped row was recorded also depended on how sync grouped changes. Duplicate detection within a batch now uses a local set, and trackSentKeys records keys only after delivery, so the prefilter's special case for tracked deletes is no longer needed. Review follow-ups: - decide eager versus abortable acquisitions inside createSubsetAcquisitionRecord so truncate reacquisition also skips the abort machinery in eager mode - mark a pass-through pipeline with undefined facades instead of a separate flag; the compiler test asserts the new marker - type the prefilter path walk as unknown and walk exactly as the evaluator - prefer a string-literal conjunct over a boolean one for the prefilter - witness a pending optimistic delete in a prefiltered unindexed scan Co-authored-by: Isaac <no-reply@databricks.com>
…d throws The stored-row prefilter already defers to the full predicate when a read throws. The subscription prefilter reads enriched change values and could still throw on a nested getter, failing publication where the full filter would drop the row. Both uses now share the guard. Co-authored-by: Isaac <no-reply@databricks.com>
Row canonicalization protected key-tracking operators from same-key insert-before-delete replacements. DISTINCT still needs it. Top-K already consolidates each key's batch and yields retractions before insertions, and materialized relations reduce by public key, so ordered, joined, grouped, subquery, and include queries now keep their compiled rows too. Removing the other gate conditions passed the full suite and a 10x oracle campaign. The keyed reduction also rejected extra contributors for a key. The output boundary now enforces that for every shape: one flush may change a key by at most one row. A white-box witness injects the violation. Co-authored-by: Isaac <no-reply@databricks.com>
indexes.test.ts carried its own copy of createIndexUsageTracker, so every scan-path change had to patch both. The shared tracker now also patches indexes created after tracking starts (such as live-query auto-indexes), and records a range lookup once, as the lookup the query made. Two collection-indexes expectations that recorded the delegated rangeQuery options for a single-bound lookup now record the lookup value. Co-authored-by: Isaac <no-reply@databricks.com>
Co-authored-by: Isaac <no-reply@databricks.com>
Each publication gave every filtered subscription the whole batch, and each ran its filter over every change. A subscription whose where clause has a top-level eq(field, string|boolean) conjunct now receives only the changes whose value or previous value holds that literal, grouped once per publication by field. Subscribers without a route, subscriptions holding stale published rows or replaying a truncate, and empty layout or readiness batches keep the whole batch. Callback order is unchanged. The route replaces the per-subscription batch skip. Route finding and reading are shared with the stored-row snapshot prefilter; its per-row enumerable-root check was redundant because a copy without the field reads it as undefined, and a single-field route reads the field directly. A 50-row update batch across 240 filtered live queries drops from 0.74 to 0.53 ms. The WHERE publication oracle adds peer subscribers on one field with different literals and a layout-only witness. Co-authored-by: Isaac <no-reply@databricks.com>
…ve-queries # Conflicts: # docs/contributing/oracle-coverage.md
Joining the two source keys with a comma let distinct pairs collide: (`a,b`, `c`) and (`a`, `b,c`) both became `[a,b,c]`, and `1` and `'1'` printed alike. The live query then dropped a row or rejected the batch. Result keys are now `JSON.stringify([mainKey, joinedKey])` with `null` for a missing side, matching the JSON keys group-by already uses. A new joined result key oracle compares published rows and key counts with a nested-loop model over delimiter-bearing and number-like keys; the comma encoding fails its pinned and generated histories. Co-authored-by: Isaac <no-reply@databricks.com>
- Check live-query result multiplicity for the whole flush before beginning the sync transaction, so a rejected flush writes no rows. - Re-read a subscription's route when its publication callback runs; an earlier callback can end routing by leaving stale rows to reconcile. - Group routed subscriptions by route path once per publication. - Move createSourceRecord to utils and use it for effect source maps. - Drop the unused storedRows option from compileEqualityPrefilter. Co-authored-by: Isaac <no-reply@databricks.com>
…ve-queries # Conflicts: # docs/contributing/oracle-coverage.md
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Summary
Speeds up the workload from #445: many small
useLiveQuerycalls filtered witheq, mounted together and updated in batches. It also fixes a mount regression main picked up since July, when queries without includes started paying for include materialization, and a pre-existing pagination bug found in review.Benchmark: the reporter's
test2.zipapp updated to current APIs, prod build, headless Chromium, 240 live queries per tab. Times are ms from click (or update) until React's render, commit, and effects finish. Same-session runs.BasicIndexonrowIdThe browser numbers include React and
useLiveQuery. The core alone, in a Node benchmark that mounts and unmounts the same 240 live queries (best of interleaved runs, ms):React's own render of the same tree takes 1.7 ms, so Redux's data layer costs only about 0.5 ms. No data layer can be much faster than Redux on mount. The remaining per-query cost is setup (compile, collection construction, first graph run, GC); shared pipelines across queries of the same shape are the planned follow-up.
Changes
query/live/materialized-pipeline.ts,query/live/collection-config-builder.ts). feat(db): rebuild includes materialization as one D2 graph #1740 ran every result through the bucket facade adapter.ARCHITECTURE.mdalready says queries without includes keep the original pipeline. A pass-through pipeline now reports no facades and publishes directly.query/compiler/index.ts). feat(db): rebuild includes materialization as one D2 graph #1740 also canonicalized every non-aggregate query through a keyedreduce. DISTINCT tracks visibility by selected value and needs it. Top-K already consolidates each key's batch and yields retractions before insertions (topKBatch), and materialized relations reduce by public key again, so other shapes skip it. Removing the other conditions passed the full suite and aTANSTACK_DB_ORACLE_RUNS_MULTIPLIER=10oracle campaign.collection-config-builder.ts). The skipped reduction used to reject extra contributors for a key. The output boundary now throws when one flush changes a key by more than one row. It checks the whole flush before beginning the sync transaction, so a rejected flush writes no rows.collection/changes.ts,collection/subscription.ts,collection/change-events.ts). A subscription whosewherehas a top-leveleq(field, string | boolean)conjunct receives only the changes whose value or previous value holds that literal, grouped once per publication by field. Subscribers without a route, subscriptions holding stale published rows or replaying a truncate, and empty layout or readiness batches keep the whole batch. Callback order is unchanged.collection/change-events.ts,collection/state.ts). The same conjunct is tested on the stored row before the row is copied to add virtual properties. The copy reads a field either from the stored row or asundefined, which never equals the literal, so a failed test proves the row fails; survivors run through the full predicate. A read that throws defers to the full predicate. With no optimistic state the scan iterates the synced rows directly.collection/subscription.ts). Ineagermode,loadSubset/unloadSubsetreturn without reading the options. Each subscription still allocated anAbortControllerand aborted it on release, which built aDOMExceptionwith a stack trace. That was the cost fix(db): harden incremental subset recovery #1756 added to mount. The decision now lives increateSubsetAcquisitionRecord, so truncate reacquisition skips it too.eqfast path (query/compiler/evaluators.ts). Same-type strings and booleans compare with===and skip normalization.SortedMap.values()as a generator method and null-prototype records keyed by source id (utils/source-record.ts, also used for effect source maps): per-call allocation and hidden-class churn in per-query setup.query/compiler/joins.ts). Breaking: joined rows used to be keyed[mainKey,joinedKey]joined with a comma, so (a,b,c) and (a,b,c) collided, as did1and'1'. On main that silently dropped a row; without change 2's reduction it threw instead. Keys are nowJSON.stringify([mainKey, joinedKey])withnullfor a missing side, e.g.["1","2"],[4,1],[4,null], matching group-by's JSON keys. Code that builds joined keys by hand must use the new format. The adapter tests'state.get('[1,1]')lookups were updated; several weretoBeUndefined()checks that would otherwise pass vacuously.Pagination fix bundled with change 4: filtered subscriptions recorded every unsent inserted or updated key in
sentKeysbefore thewhereclause ran, so rows the filter dropped still counted as sent. For an ordered, limited subscription that inflated the nextloadSubsetoffset and skipped rows. It also made a later matching reinsertion look like a duplicate, which CodeRabbit found.sentKeysnow records only published rows. A focused witness incollection-subscription.test.tschecks the page offset for dropped inserts and updates, alone and beside matching changes.Oracle coverage
The coverage map had no owner for WHERE-clause three-valued logic or for publication to many filtered subscribers. This PR adds
tests/query/where-predicate-publication-oracle.property.test.ts(intest:oracles):NaN, a valid Date,null, a missing field, and virtual fields.currentStateAsChanges, and peer subscribers on one field with different literals plus one on a virtual field.where-prefilter-property-visibility.test.tscovers inherited, non-enumerable, enumerable-own, and nested getters for both prefilter uses.live-query-result-multiplicity.test.tswitnesses the output-boundary check, including that a rejected flush leaves the published rows and pending sync transactions unchanged.tests/query/join-result-key-oracle.property.test.ts(intest:oracles) compares inner, left, and full joins with a nested-loop model over delimiter-bearing, bracket-bearing, quoted, and number-like keys, checking published rows and key counts after preload and each synced change. The comma encoding fails its pinned and generated histories.Hostile mutants that passed the pre-existing
@tanstack/dbsuite and fail now include: FALSE-for-UNKNOWNeq;oroperands or number literals treated as routable; routing that ignores the previous value, ignores the field, delivers twice, or routes while stale rows await reconciliation; skipping readiness or layout-only batches; recording dropped rows as sent; and a scan fast path that ignores optimistic inserts or deletes.docs/contributing/oracle-coverage.mdrecords the remaining equivalent mutants and open histories.Mount regression since July
Interleaved runs at each merge point attribute the indexed-mount regression (2.8 → 7.7 ms):
DOMException(change 6)Merging current main (#1949, #1952, #1953, #1955) into this branch added ~0.7 ms to unindexed mount; that is tracked as a follow-up.
Verification
@tanstack/db: 229 files, 7,495 tests pass.test:oraclesatTANSTACK_DB_ORACLE_RUNS_MULTIPLIER=10: 51 files, 2,868 pass.db-ivm636,react-db322,vue-db118,solid-db86,svelte-db114,angular-db64,query-db-collection892 pass.tsc --noEmit -p packages/db/tsconfig.jsonis clean after building@tanstack/db.Follow-ups (not in this PR)
useLiveQuerywith the deprecateddepsarray derives query identity on every render (about 0.9 ms per 240 mounts).Related: #445
This pull request and its description were written by Isaac.