Deep Lake Files

## Deeplake v4.5.1 Release Notes

### Performance

• mimalloc allocator — Switched core allocations to mimalloc for lower overhead
• simdjson log parsing — Faster deeplog deserialization via simdjson
• LZ4 compressed deeplog logs — Reduced on-disk deeplog size
• String optimizations and SIMD-accelerated code paths
• Reduced nd::array sizeof — Smaller per-array memory footprint
• In-place downloads — Reduced memory copies in clustered index path
• Async prefetcher priority fix

### Features

• Null value support — Full null handling in arrays, serialization, and log/replay
• Column statistics — Statistics gathering for datasets
• Link content passthrough — Pass content directly to link types
• Binary catalog datasets — Table-catalog-type dataset creation

### Bug Fixes

• BM25 & inverted index — Fixed unindexed search and IN operator queries
• exact_text search — Corrected exact text search
• Fork safety — Fixed deadlock in async queues after fork()
• Credentials refresh timing — Fixed refresh timing bug
• Region detection delay — Fixed slow region auto-detection
• Link[bytes] update — Corrected update path
• Sanitizer fixes — Multiple UBSan/TSan/ASan issues resolved