Stoolap Files

What's New in v0.2.2

CompactArc - Memory-Efficient Reference Counting (#9)

• Introduced CompactArc<T>, a thread-safe reference-counted pointer without weak reference support
• Saves 8 bytes per allocation compared to std::Arc (16 bytes vs 24 bytes overhead)
• Particularly effective for Value storage in rows and indexes

Memory Optimizations (#9)

• ColumnarResult: Column-major storage for window functions, reducing allocations from O(rows) to O(columns) with lazy row materialization
• Deferred projection: For ORDER BY + LIMIT queries, defer projection until after sorting/limiting to reduce allocations from O(matched) to O(limit)
• ParallelVec: Direct parallel writes to disjoint indices in window functions, eliminating per-partition Vec allocations
• Arc\<str> keys: Zero-cost key cloning in hot per-row loops for correlated subquery evaluation

CompactVec and RowVec (#7)

• CompactVec\<T>: A 16-byte vector (vs Vec's 24 bytes) - 33% smaller footprint per Row instance
• RowVec: Thread-local pooled Vec<(i64, Row)> with best-fit allocation, reducing allocation churn for repeated query execution

Bug Fixes

• Fix streaming path for non-correlated scalar subqueries (were unnecessarily disabled from streaming)
• Add bounds checking to CompactVec extend/from_iter to prevent buffer overflow from malicious iterators

Other Changes

• Add optional mimalloc allocator (--features mimalloc)
• Add fuzz testing targets for SQL parser, expressions, queries, and transactions

Full Changelog: https://github.com/stoolap/stoolap/compare/v0.2.1...v0.2.2