refactor: optimize relation selections and avoid unnecessary nested queries #213
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Note Other AI code review bot(s) detectedCodeRabbit has detected other AI code review bot(s) in this pull request and will avoid duplicating their findings in the review comments. This may lead to a less comprehensive review. WalkthroughAdds two helpers to BaseCrudDialect (duplicated in the patch), changes Postgres/SQLite relation JSON assembly to choose direct vs nested joins via canJoinWithoutNestedSelect, centralizes join-filter logic, changes relation aliasing to use a root result alias and $data paths, and tweaks name-mapper alias emission. Changes
Estimated code review effort🎯 4 (Complex) | ⏱️ ~60 minutes Possibly related PRs
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Claude finished @ymc9's task —— View job Code Review CompleteReviewed the relation optimization refactor across 4 files. This is a well-implemented performance optimization that avoids unnecessary nested queries. Review Tasks
🟢 Code Quality & Best PracticesExcellent implementation with clean separation of concerns:
Code style consistency maintained:
🟢 Performance ConsiderationsSignificant optimization potential: The optimization targets a key performance bottleneck by avoiding nested subqueries when they're not necessary. The conditions in
Performance impact:
🟢 Security ImplicationsNo security concerns identified:
🟡 Potential Issues & Suggestions1. Minor Code Duplication 2. Name-Mapper Change ( 3. TODO Comments 🟢 Test Coverage RecommendationsCritical test scenarios:
Specific test cases to add:
🎯 Overall AssessmentVerdict: Excellent refactoring ✅ This is a well-thought-out optimization that:
The code quality is high, performance benefits are clear, and security is maintained. The main recommendation is to ensure comprehensive test coverage for both the optimization and fallback paths. No blocking issues identified. This PR is ready for merge pending test validation. --- | Branch: |
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Pull Request Overview
This PR optimizes relation selections by introducing a conditional approach to avoid unnecessary nested queries when simple joins suffice. The optimization reduces query complexity while maintaining the same functionality.
- Introduces
canJoinWithoutNestedSelect()method to determine when simple joins can be used instead of nested subqueries - Refactors SQLite and PostgreSQL dialects to use direct joins when possible, falling back to nested queries only when required
- Extracts common join filter logic into reusable methods and updates column alias naming for consistency
Reviewed Changes
Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.
| File | Description |
|---|---|
| packages/runtime/src/client/executor/name-mapper.ts | Improves table alias logic to avoid redundant aliases when mapped name equals model name |
| packages/runtime/src/client/crud/dialects/sqlite.ts | Implements conditional join optimization and extracts relation join filter logic into reusable method |
| packages/runtime/src/client/crud/dialects/postgresql.ts | Refactors relation building to use conditional joins and improves method parameter naming |
| packages/runtime/src/client/crud/dialects/base.ts | Adds shared utility methods for model selection building and join optimization detection |
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Claude finished @ymc9's task —— View job Code Review CompleteReviewed the relation optimization refactor across 4 files. This is a well-implemented performance optimization that avoids unnecessary nested queries. Review Tasks
🟢 Code Quality & Best PracticesExcellent implementation with clean separation of concerns:
Code style consistency maintained:
🟢 Performance ConsiderationsSignificant optimization potential: The optimization targets a key performance bottleneck by avoiding nested subqueries when they're not necessary. The conditions in
Performance impact:
🟢 Security ImplicationsNo security concerns identified:
🟡 Potential Issues & Suggestions1. Minor Code Duplication 2. Name-Mapper Change ( 3. TODO Comments 🟢 Test Coverage RecommendationsCritical test scenarios:
Specific test cases to add:
🎯 Overall AssessmentVerdict: Excellent refactoring ✅ This is a well-thought-out optimization that:
The code quality is high, performance benefits are clear, and security is maintained. The main recommendation is to ensure comprehensive test coverage for both the optimization and fallback paths. No blocking issues identified. This PR is ready for merge pending test validation. --- | Branch: |
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Actionable comments posted: 3
Caution
Some comments are outside the diff and can’t be posted inline due to platform limitations.
⚠️ Outside diff range comments (1)
packages/runtime/src/client/crud/dialects/postgresql.ts (1)
244-271: Bug: missing alias for scalar fields in selective projectionFor the selective branch, non-relation fields call fieldRef with undefined alias. This can produce invalid/ambiguous column refs since the relation is aliased (relationModelAlias).
Apply this diff:
- const fieldDef = requireField(this.schema, relationModel, field); - const fieldValue = fieldDef.relation - ? // reference the synthesized JSON field - eb.ref(`${parentResultName}$${field}.$data`) - : // reference a plain field - this.fieldRef(relationModel, field, eb, undefined, false); + const fieldDef = requireField(this.schema, relationModel, field); + const fieldValue = fieldDef.relation + ? // reference the synthesized JSON field + eb.ref(`${parentResultName}$${field}.$data`) + : // reference a plain field using the correct table alias + this.fieldRef(relationModel, field, eb, relationModelAlias, false);
🧹 Nitpick comments (2)
packages/runtime/src/client/crud/dialects/sqlite.ts (2)
110-123: Guard descendant JSON projection or ensure it existsGiven the change above, this is fine. If you prefer not selecting all fields, gate this block behind a flag and only push descendant JSON when it’s actually selected.
204-252: Join-filter centralization is correct; consider EXISTS for M2MLogic for M2M and FK relations is correct. For large join tables, EXISTS can be more index-friendly than IN.
Proposed alternative for the M2M branch:
- selectModelQuery = selectModelQuery.where((eb) => - eb( - eb.ref(`${relationModelAlias}.${relationIds[0]}`), - 'in', - eb - .selectFrom(m2m.joinTable) - .select(`${m2m.joinTable}.${m2m.otherFkName}`) - .whereRef(`${parentAlias}.${parentIds[0]}`, '=', `${m2m.joinTable}.${m2m.parentFkName}`), - ), - ); + selectModelQuery = selectModelQuery.where((eb) => + eb.exists( + eb + .selectFrom(m2m.joinTable) + .select((eb2) => eb2.val(1)) + .whereRef(`${parentAlias}.${parentIds[0]}`, '=', `${m2m.joinTable}.${m2m.parentFkName}`) + .whereRef(`${relationModelAlias}.${relationIds[0]}`, '=', `${m2m.joinTable}.${m2m.otherFkName}`), + ), + );
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📒 Files selected for processing (4)
packages/runtime/src/client/crud/dialects/base.ts(3 hunks)packages/runtime/src/client/crud/dialects/postgresql.ts(6 hunks)packages/runtime/src/client/crud/dialects/sqlite.ts(4 hunks)packages/runtime/src/client/executor/name-mapper.ts(1 hunks)
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{packages,samples,tests}/**
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Packages are located in
packages/,samples/, andtests/
Files:
packages/runtime/src/client/executor/name-mapper.tspackages/runtime/src/client/crud/dialects/postgresql.tspackages/runtime/src/client/crud/dialects/base.tspackages/runtime/src/client/crud/dialects/sqlite.ts
🧬 Code graph analysis (3)
packages/runtime/src/client/crud/dialects/postgresql.ts (5)
packages/runtime/src/client/crud-types.ts (1)
FindArgs(646-662)packages/sdk/src/schema/schema.ts (2)
GetModels(108-108)FieldDef(59-74)packages/runtime/src/client/crud/operations/base.ts (2)
requireField(117-119)requireModel(109-111)packages/runtime/src/client/query-utils.ts (5)
requireField(33-39)requireModel(20-26)getManyToManyRelation(222-258)getIdFields(41-44)buildJoinPairs(197-215)packages/common-helpers/src/tiny-invariant.ts (1)
invariant(4-14)
packages/runtime/src/client/crud/dialects/base.ts (2)
packages/sdk/src/schema/schema.ts (2)
GetModels(108-108)ModelDef(20-36)packages/runtime/src/client/crud-types.ts (1)
FindArgs(646-662)
packages/runtime/src/client/crud/dialects/sqlite.ts (3)
packages/runtime/src/client/query-utils.ts (4)
requireField(33-39)getManyToManyRelation(222-258)getIdFields(41-44)getRelationForeignKeyFieldPairs(55-100)packages/sdk/src/schema/schema.ts (1)
GetModels(108-108)packages/common-helpers/src/tiny-invariant.ts (1)
invariant(4-14)
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- GitHub Check: build-test (20.x)
🔇 Additional comments (7)
packages/runtime/src/client/executor/name-mapper.ts (1)
354-361: Omit redundant aliases: good change; scope remains resolvableUsing finalAlias avoids emitting an alias when model/table names match while keeping scope.alias set for name resolution. This aligns with Kysely refs and reduces noise.
packages/runtime/src/client/crud/dialects/sqlite.ts (1)
192-198: Consistent $data aliasingSwitching to $data is consistent with Postgres and downstream references. LGTM.
packages/runtime/src/client/crud/dialects/base.ts (1)
966-989: New buildModelSelect helper: solid extractionGood reuse point; sequencing of selectAllFields and filter/sort/take is correct.
packages/runtime/src/client/crud/dialects/postgresql.ts (4)
149-181: Join-filter centralization: looks correctM2M invariants and FK join-pair wiring are correct; good reuse across nested/direct paths.
61-71: Result aliasing via relationResultName + $data is cleanSelecting ${relationResultName}.$data as the final field simplifies nested access. LGTM.
84-147: Use of LEFT JOIN LATERAL is appropriateEnsures null on no-match and supports nested relation joins. Good choice for Postgres.
270-271: No additional undefined-alias usages foundI ran the suggested ripgrep checks.
- The only occurrence of
this.fieldRef(..., undefined, false)is at line 270 in
packages/runtime/src/client/crud/dialects/postgresql.ts.- Calls to
buildModelSelect(..., payload, false)appear as expected in
packages/runtime/src/client/crud/dialects/sqlite.ts(line 81) and
packages/runtime/src/client/crud/dialects/postgresql.ts(line 93), with no unexpectedundefinedalias.All other patterns are accounted for. Resolving this comment.
Summary by CodeRabbit
Bug Fixes
Refactor