perf(store): avoid O(N²) catalog flush and path scan in reindex_paths#14
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reindex_paths() did a linear scan over all documents to find each file's existing DocumentId, and flushed the full on-disk catalog after every single added/updated file — turning an N-document reindex into O(N²) work. Build a path->(id, position) map once up front, and defer the catalog flush to a single call after the batch completes. Benchmarked on 3000 changed files: 5.6s -> 0.17s.
The use_mimalloc feature added the dependency and Cargo feature flag but never set #[global_allocator], so it had no effect on the binary.
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reindex_paths() did a linear scan over all documents to find each file's existing DocumentId, and flushed the full on-disk catalog after every single added/updated file — turning an N-document reindex into O(N²) work. Build a path->(id, position) map once up front, and defer the catalog flush to a single call after the batch completes.
Benchmarked on 3000 changed files: 5.6s -> 0.17s.