fix(db): preserve pushed subquery predicates - #1877
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Included review availability: Your plan provides up to 8 included reviews per hour; 7 remain after this review. 📝 WalkthroughWalkthroughThe optimizer remaps predicates pushed into subqueries. The compiler uses optimized query IR when it differs from the original. Tests cover query equivalence and outer filters on joined and FROM subqueries. ChangesSubquery predicate compilation
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Bug fix · Severity of issue fixed: Medium Suggested reviewers: Merge Risk: ⚪ Minimal · up to The joined-subquery filter now maps to the correct field, and no remaining issue is established that should prevent merging after normal checks. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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Inline comments:
In `@packages/db/src/query/optimizer.ts`:
- Around line 1011-1016: Update the path fallback in the PropRef remapping logic
to avoid prefixing joined-subquery result paths with firstFromAlias. Map
namespaced paths to the corresponding source alias, and leave the predicate
outside when its path cannot be mapped; preserve existing behavior for projected
PropRef paths.
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.changeset/fix-subquery-predicate-compilation.mdpackages/db/src/query/compiler/index.tspackages/db/src/query/compiler/joins.tspackages/db/src/query/compiler/query-equivalence.tspackages/db/src/query/compiler/types.tspackages/db/src/query/optimizer.tspackages/db/tests/query/compiler/subquery-caching.test.tspackages/db/tests/query/join-subquery.test.tspackages/db/tests/query/optimizer.test.ts
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Inline comments:
In `@packages/db/src/query/optimizer.ts`:
- Around line 1018-1020: Update the fallback that constructs PropRef paths using
hasNamespacedResult and firstFromAlias so filters on spread-selected fields
resolve to their original source paths. If the mapping is unknown, keep the
predicate outside the subquery rather than applying it to an incorrect path.
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packages/db/src/query/optimizer.tspackages/db/tests/query/join-subquery.test.ts
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Summary
Preserve predicates pushed into existing JOIN and FROM subqueries instead of compiling the original pre-optimization query. Queries now return the filtered rows for both scan and auto-indexed execution, including when the outer QueryRef alias differs from the subquery's internal alias.
Root cause
The optimizer correctly moved a single-source outer predicate into an existing
QueryRef, then removed it from the outer query. Recursive compilation usedQueryMappingto replace that optimized query with its user-authored origin for cache identity, which silently discarded the pushed predicate. Predicates pushed through a renamed QueryRef also retained the outer alias inside the subquery, where that namespace does not exist.Approach
QueryMappingas lineage rather than unconditional IR substitution..innerJoin(), alias remapping, and cache classification.Key invariants
Non-goals
This does not redesign compiled-pipeline ownership when the exact same subquery object occupies both sides of a join. That separate pre-existing cache/graph case needs an explicit ownership decision.
Verification
git diff --check: passed.Files changed
@tanstack/db.Fixes #1876
Summary by CodeRabbit
FROMsubqueries so outer predicates are preserved and applied correctly, including when the outer and inner queries use different aliases.UNION ALLsubqueries so matching records are returned correctly.