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MPCoreDeveloper
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multiple improvements on speed , bacward compatible , added acces to raw native sharpcoreDB api
multiple benchmark tests added lots of good work !!
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‎README.md‎

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@@ -71,6 +71,10 @@ After the `IAsyncDisposable` lifecycle refactor and SQL lexer/parser fixes, benc
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All other benchmarks (25 total) remain stable. Full results: [`docs/BENCHMARK_RESULTS.md`](docs/BENCHMARK_RESULTS.md)
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### ⚡ SIMD Columnar Engine Optimization (April 2026)
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All 16 columnar SIMD aggregate methods now use `Vector256.LoadUnsafe` instead of `Vector256.Create(data.AsSpan(...))`, eliminating per-iteration `Span<T>` construction and bounds checking overhead in AVX2 hot loops. This applies to both single-threaded and parallel SIMD paths for SUM, MIN, and MAX across `int`, `long`, and `double` column types. The companion performance test (`ColumnStore_Average_10kRecords_Under2ms`) was hardened with multi-iteration best-time measurement to prevent false failures under concurrent test load.
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### 📚 Documentation Policy
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- Canonical documentation entry points are `docs/INDEX.md` and `docs/README.md`.
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- ACID transactions with WAL
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- B-tree and hash indexing
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- Full-text search
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- SIMD-accelerated operations
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- SIMD-accelerated operations (`Vector256.LoadUnsafe` optimized)
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- Memory pooling and JIT optimizations
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‎docs/CHANGELOG.md‎

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@@ -8,6 +8,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
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## [Unreleased]
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### Added
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- **SIMD LoadUnsafe Optimization**: All 16 columnar SIMD aggregate methods (`SumInt32`, `SumInt64`, `SumDouble`, `MinInt32`, `MinInt64`, `MinDouble`, `MaxInt32`, `MaxInt64` — both single-threaded and parallel variants) now use `Vector256.LoadUnsafe(ref data[i])` instead of `Vector256.Create(data.AsSpan(i))`. This eliminates per-iteration `Span<T>` construction and bounds checking overhead in SIMD hot loops, yielding tighter codegen on AVX2 hardware.
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- **Auto-ROWID**: Tables created without an explicit `PRIMARY KEY` now receive a hidden `_rowid` column (ULID type, auto-generated). Follows the SQLite rowid pattern — invisible in `SELECT *`, visible when explicitly queried via `SELECT _rowid, ...`. See [`docs/features/AUTO_ROWID.md`](features/AUTO_ROWID.md) for full documentation.
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- `Table.HasInternalRowId` property (persisted in metadata) to track tables with auto-generated `_rowid`.
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- `Table.SelectIncludingRowId()` method for queries that explicitly request `_rowid`.
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- Added LINQ translator handling for `ExpressionType.Convert` / `ConvertChecked` in enum-related comparison scenarios.
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- Improved German locale comparison behavior for `ß/ss` equivalence in locale-aware matching.
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- Fixed PAGE_BASED mixed-predicate filtering (`column = value AND other_column <= value`) by routing scan-time predicate evaluation through the shared SQL condition evaluator; added regression coverage for `ORDER BY ... LIMIT` retrieval.
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- **ColumnStore SIMD consistency**: Cleaned up inconsistent `MaxInt64SIMDDirect` implementation (previously used manual `ref` + `Unsafe.Add` pattern) to use the same `Vector256.LoadUnsafe(ref data[i])` pattern as all other SIMD methods.
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### Changed
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- Updated project documentation and status reports to reflect current implementation and validation baseline.
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- Explicitly documented the remaining deferred single-file parameterized `ExecuteCompiled` disposal deadlock path.
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- **Performance test hardening**: `ColumnStore_Average_10kRecords_Under2ms` now runs 10 iterations and asserts the best (minimum) time, with an additional warmup call. This eliminates false failures caused by concurrent test execution, GC pauses, or OS scheduling jitter.
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## [1.6.0] - 2026-03-30
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‎results/comparative_20260404_130621.json‎

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{
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"SharpCoreDB": {
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"InsertTime": 0.2365623,
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"InsertOpsPerSec": 84544,
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"ReadTime": 13.3127626,
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"ReadOpsPerSec": 150,
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"UpdateTime": 6.2586697,
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"UpdateOpsPerSec": 319,
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"DeleteTime": 0.660518,
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"DeleteOpsPerSec": 3027
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},
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"SQLite": {
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"InsertTime": 0.1717671,
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"InsertOpsPerSec": 116436,
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"ReadOpsPerSec": 78378,
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"UpdateOpsPerSec": 151250,
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"DeleteTime": 0.0076601,
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"DeleteOpsPerSec": 261093
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},
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"LiteDB": {
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"InsertTime": 0.5405699,
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"InsertOpsPerSec": 36997,
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"ReadTime": 0.1774102,
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"ReadOpsPerSec": 11273,
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"UpdateTime": 0.3487938,
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"UpdateOpsPerSec": 5734,
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"DeleteTime": 0.2002202,
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"DeleteOpsPerSec": 9989
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}
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}

‎results/comparative_20260404_132103.json‎

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{
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"InsertOpsPerSec": 81299,
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"DeleteTime": 0.5494488,
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"DeleteOpsPerSec": 3640
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},
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"SQLite": {
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"DeleteOpsPerSec": 239598
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},
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"LiteDB": {
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}
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}

‎results/comparative_20260404_134441.json‎

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"DeleteTime": 22.6771491,
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"DeleteOpsPerSec": 88
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},
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"SQLite": {
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},
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"LiteDB": {
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"DeleteTime": 0.197719,
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"DeleteOpsPerSec": 10115
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}
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}

‎results/comparative_20260404_141124.json‎

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{
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"SQLite": {
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"ReadTime": 0.1133879,
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"ReadOpsPerSec": 88192,
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"UpdateOpsPerSec": 249133,
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"DeleteTime": 0.0274189,
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"DeleteOpsPerSec": 364711
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},
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"LiteDB": {
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"ReadOpsPerSec": 13111,
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"UpdateOpsPerSec": 9016,
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"DeleteOpsPerSec": 12732
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}
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}

‎results/comparative_20260404_142503.json‎

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{
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"UpdateOpsPerSec": 243387,
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"DeleteTime": 0.0278009,
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"DeleteOpsPerSec": 359700
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},
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"LiteDB": {
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"InsertTime": 1.3534519,
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"InsertOpsPerSec": 73885,
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}
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}

‎results/comparative_20260404_142905.json‎

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{
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"DeleteTime": 3.3109493,
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},
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"SQLite": {
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"UpdateOpsPerSec": 199262,
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"DeleteTime": 0.0344733,
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"DeleteOpsPerSec": 290079
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},
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"LiteDB": {
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"InsertTime": 1.3918513,
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"InsertOpsPerSec": 71846,
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"ReadTime": 0.9546118,
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"ReadOpsPerSec": 10475,
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"UpdateOpsPerSec": 7938,
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}
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}

‎results/comparative_20260404_190937.json‎

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{
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"DeleteTime": 2.4872278,
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"DeleteOpsPerSec": 4020
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},
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"LiteDB": {
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}

‎results/comparative_20260404_193250.json‎

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},
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"LiteDB": {
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}

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