# TensorLogic Adapters — TODO

**Status**: Stable | **Version**: 0.1.1 | **Released**: 2026-04-06 | **Last Updated**: 2026-06-09
**History**: See [CHANGELOG.md](../../CHANGELOG.md) for release history.

External-data adapters (RDF import, SQL/NoSQL bridges) and code generators (Rust, Python, TypeScript, GraphQL).

## Completed

- [x] Basic DomainInfo structure
- [x] PredicateInfo structure with argument domains
- [x] SymbolTable for managing domains and predicates
- [x] Builder pattern for DomainInfo and PredicateInfo
- [x] Description and metadata support
- [x] Domain/predicate lookup by name
- [x] Basic validation (duplicate names, unknown domains)
- [x] Comprehensive test coverage (59 tests, all passing)
- [x] Mixed operation support (logical + arithmetic)
- [x] **Domain hierarchy with subtype relationships**
- [x] **Predicate constraints (properties, ranges, dependencies)**
- [x] **YAML schema import/export**
- [x] **Schema validation (completeness, consistency, semantic)**
- [x] **Parametric types (List<T>, Option<T>, Pair<A,B>, Map<K,V>)**
- [x] **Predicate composition system**
- [x] **Rich metadata with provenance tracking**
- [x] **Tagging system for domains and predicates**
- [x] **Comprehensive README.md documentation**
- [x] **Incremental Validation** with change tracking and dependency graphs
- [x] **Query Planner** with cost-based optimization
- [x] **Schema Evolution** with breaking change detection and migration planning

### Core Functionality
- [x] Predicate signature validation (arity checking)
- [x] Domain hierarchy
  - [x] Support subtype relationships (Person <: Agent)
  - [x] Transitive subtype checking
  - [x] Ancestor/descendant queries
  - [x] Least common supertype finding
  - [x] Cycle detection
- [x] Predicate constraints
  - [x] Value ranges (min/max, inclusive/exclusive)
  - [x] Functional dependencies
  - [x] Logical properties (symmetric, transitive, reflexive, etc.)
  - [x] PredicateConstraints builder pattern

### Schema Import/Export
- [x] JSON schema format
  - [x] Serialize SymbolTable to JSON
  - [x] Deserialize from JSON with validation
- [x] YAML support
  - [x] Human-readable schema definitions
  - [x] Serialize to YAML
  - [x] Deserialize from YAML

### Validation
- [x] Schema completeness checking
  - [x] Ensure all referenced domains exist
  - [x] Detect orphaned predicates
  - [x] Warn about unused domains
- [x] Consistency validation
  - [x] Check for duplicate definitions
  - [x] Validate domain cardinalities
  - [x] Ensure predicate well-formedness
  - [x] Validate hierarchy is acyclic
- [x] Semantic validation
  - [x] Detect unused domains
  - [x] Warn about "Unknown" domain types
  - [x] Suggest missing predicates (equality)

### Advanced Features (v0.1.0)
- [x] **Incremental Validation System** (900+ lines, 19 tests)
  - [x] ChangeTracker for recording schema modifications
  - [x] DependencyGraph for transitive dependency computation
  - [x] IncrementalValidator with intelligent caching
  - [x] ValidationCache with LRU eviction
  - [x] 10-100x speedup for large schemas with small changes
  - [x] Batch operation support
  - [x] Detailed validation reports with cache statistics
- [x] **Query Planner** (700+ lines, 13 tests)
  - [x] Cost-based query optimization
  - [x] Multiple index strategies (Hash O(1), Range O(sqrt-n), Inverted O(log n))
  - [x] PredicatePattern matching with wildcards
  - [x] Complex query support (AND/OR combinations)
  - [x] Query plan caching with statistics tracking
  - [x] 5 query types: by_name, by_arity, by_signature, by_domain, by_pattern
- [x] **Schema Evolution** (750+ lines, 11 tests)
  - [x] EvolutionAnalyzer for schema comparison
  - [x] Breaking change detection with impact analysis
  - [x] Migration plan generation
  - [x] Semantic versioning guidance (Major/Minor/Patch)
  - [x] Backward compatibility checking
  - [x] Affected predicate detection
  - [x] Domain cardinality change tracking
- [x] **Performance Benchmarks** (33 benchmark groups total)
  - [x] Incremental validation benchmarks (6 groups)
  - [x] Query planner benchmarks (6 groups)
  - [x] Schema evolution benchmarks (8 groups)
  - [x] Cache, merge, and utility benchmarks (13 additional groups)

## In Progress

(Nothing currently in progress - all planned features complete for v0.1.0)

## Recently Completed

### Performance Optimizations
- [x] **String interning** (StringInterner, thread-safe with Arc<RwLock>, memory stats)
- [x] **Lookup caching** (LookupCache with LRU eviction, access counts, cache stats)
- [x] **Performance module** with 8 comprehensive tests

### Property-Based Testing
- [x] **Comprehensive proptest suite** (15 property tests + 4 deterministic tests) covering JSON/YAML round-trip, domain/predicate consistency, hierarchy acyclicity, interner consistency, memory stats, and variable-binding domain checks

### Performance Benchmarks
- [x] **Criterion-based benchmark suite** (33 benchmark groups) covering domain/predicate addition and lookup, JSON/YAML serialization, schema validation, string interning, lookup cache, hierarchy operations, and memory stats

### Compiler Integration
- [x] **Export utilities** (CompilerExport/Import, SymbolTableSync, bundle validation) — 8 basic tests
- [x] **Advanced compiler integration** (CompilerExportAdvanced covering hierarchies, constraints, refinement/dependent/linear/effect types via CompleteExportBundle) — 9 advanced tests, 17 total

### Test Coverage
- [x] **602 tests passing** (100% pass rate), 12 doctests passing, zero compilation/clippy warnings (all targets)

## Medium Priority

### Advanced Features
- [x] Multi-domain predicates (cross-domain relationships, domain product types)
- [x] Parameterized domains (generic definitions, bounded type parameters)
- [x] Computed domains (filter/union/intersection/difference, ComputedDomainRegistry)
- [x] Predicate composition (macro expansion, templates)

### Metadata Management
- [x] Rich metadata (provenance, version history, change tracking)
- [x] Documentation integration (long-form docs, examples, usage notes)
- [x] Tagging system (categories, filter and query by tag)

### Performance
- [x] Efficient lookup structures (indexed O(1) signature matching, LookupCache, SignatureMatcher)
- [x] Memory optimization (StringInterner, CompactSchema, lazy loading)

## Low Priority

### Documentation
- [x] README.md (purpose, usage examples, integration guide)
- [x] API documentation (rustdoc, examples, best practices)
- [x] Tutorial via examples (defining domains/predicates, validating schemas)

### Testing
- [x] Property-based tests (proptest, round-trip serialization, validation invariants)
- [x] Integration tests (real-world schemas, compiler interop)
  - [ ] Interop with oxirs-bridge (FUTURE)
- [x] Performance benchmarks (criterion, MemoryStats, serialization speed)

### Tooling
- [x] Schema validation CLI (schema_validate binary, SchemaValidator, SchemaAnalyzer, SchemaStatistics)
- [x] Schema migration tool (JSON<->YAML, merge, diff, compatibility checks)
- [x] Schema diff tool (SchemaDiff, DiffSummary, CompatibilityLevel)

### Distributed Schema Synchronization
- [x] **Distributed synchronization system** (900+ lines, 17 tests): NodeId, VectorClock, SyncEvent, SyncProtocol trait with InMemorySyncProtocol test impl, ConflictResolution (LastWriteWins/FirstWriteWins/Manual/Merge/VectorClock), SynchronizationManager, EventListener, ApplyResult, bidirectional propagation, conflict detection, stats tracking. Example 24 + 6 benchmark groups.

## Future Enhancements

### Code Generation (Complete)
- [x] **Rust code generation** (RustCodegen with domain/predicate types, bounds checking, configurable derives) — 7 tests
- [x] **GraphQL schema generation** (GraphQLCodegen with Query/Mutation types, camelCase conversion) — 8 tests, Example 16
- [x] **TypeScript code generation** (TypeScriptCodegen with branded types, validators, JSDoc) — 6 tests
- [x] **Python bindings generation** (PythonCodegen for .pyi stubs, PyO3 bindings, dataclasses) — 7 tests

### Advanced Type System (Complete)
- [x] **Refinement types** (RefinementPredicate/Type/Context/Registry, 18 predicate kinds, built-ins like PositiveInt/Probability) — 15 tests
- [x] **Dependent types** (DimExpr, DependentType for Vector<T,n>/Matrix<m,n>, DimConstraint, common patterns, simplification) — 17 tests
- [x] **Linear types** (LinearKind Unrestricted/Linear/Affine/Relevant, LinearContext with scope, LinearTypeRegistry with GpuTensor/FileHandle) — 17 tests
- [x] **Effect system** (14 Effect types, EffectSet/Row, EffectHandler, EffectContext, inference from sequences) — 15 tests

### Database Integration (Complete)
- [x] **In-memory database** (SchemaDatabase trait, MemoryDatabase with versioning, SQL gen utilities) — 13 tests
- [x] **SQLite backend** [feature = "sqlite"] (SQLiteDatabase with rusqlite, persistent file storage, auto-init, version history) — 13 tests
- [x] **PostgreSQL backend** [feature = "postgres"] (PostgreSQLDatabase with tokio-postgres, async API, multi-user, auto-init, version history)
- [x] **Multi-user locking** (LockedSymbolTable with read/write locks, transactions, lock stats, timeouts) — 15 tests, Example 23
- [x] **Schema sync across nodes** (vector clocks, conflict resolution, event propagation) — 17 tests, Example 24

### AI/ML Integration (Complete)
- [x] **Schema embeddings** (SchemaEmbedder 64-dim, SimilaritySearch with cosine/Euclidean, configurable weights) — 13 tests
- [x] **Auto-completion** (AutoCompleter with pattern DB, domain/predicate/variable suggestions, confidence scoring) — 12 tests
- [x] **Schema Learning from Data** (SchemaLearner with JSON/CSV support, type inference, constraint inference, relationship detection, LearningStatistics, InferenceConfig) — 15 tests, Example 21
- [x] **Schema Recommendation** (SchemaRecommender with similarity/pattern/collaborative/hybrid strategies, RecommendationContext, usage tracking, RecommenderStats) — 13 tests, Example 22

### Advanced Caching & Merging (Complete)
- [x] **Query Result Caching** (~600 lines): QueryCache<T> with TTL + LRU, CacheConfig presets, QueryCacheStats, typed CacheKey, SymbolTableCache — 9 tests
- [x] **Schema Merge Strategies** (~600 lines): SchemaMerger with 5 strategies (KeepFirst/KeepSecond/FailOnConflict/Union/Intersection), MergeResult/Report, MergeConflictResolution — 7 tests
- [x] **Advanced Utility Functions** (~600 lines): BatchOperations, ConversionUtils, QueryUtils, ValidationUtils, StatisticsUtils — 10 tests

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## v0.2.0 / Future Work

- [x] ~~**Split `src/database.rs`** (currently 1,613 lines) into `database/{mod,mysql,postgres,sqlite}.rs` or similar natural boundaries — same pattern as the 2026-04-14 `codegen.rs` split.~~ (completed 2026-04-15)
- **Expand `sparql_gen.rs` split** coordinated with `tensorlogic-oxirs-bridge`.
- **Streaming ingest** for large RDF / CSV imports.
- **Schema-driven code generation** for arbitrary JSON Schema input.
