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[BUG]: <100 items, >20% delete Wrong distance comparison in local HNSW #4334

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tazarov
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@tazarov tazarov commented Apr 21, 2025

Fixes: #4275

Description of changes

Summarize the changes made by this PR.

  • Improvements & Bug fixes
    • Fixes an issue a logical error in distance comparison when adding RecordDistance to heap. We're looking for minimal no maximal distance
    • When traversing a index with less than 100 items and more than 20% of the data deleted

Test plan

How are these changes tested?

  • Tests pass locally with pytest for python, yarn test for js, cargo test for rust

Documentation Changes

Are all docstrings for user-facing APIs updated if required? Do we need to make documentation changes in the docs repository?

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Reviewer Checklist

Please leverage this checklist to ensure your code review is thorough before approving

Testing, Bugs, Errors, Logs, Documentation

  • Can you think of any use case in which the code does not behave as intended? Have they been tested?
  • Can you think of any inputs or external events that could break the code? Is user input validated and safe? Have they been tested?
  • If appropriate, are there adequate property based tests?
  • If appropriate, are there adequate unit tests?
  • Should any logging, debugging, tracing information be added or removed?
  • Are error messages user-friendly?
  • Have all documentation changes needed been made?
  • Have all non-obvious changes been commented?

System Compatibility

  • Are there any potential impacts on other parts of the system or backward compatibility?
  • Does this change intersect with any items on our roadmap, and if so, is there a plan for fitting them together?

Quality

  • Is this code of a unexpectedly high quality (Readability, Modularity, Intuitiveness)

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tazarov commented Apr 21, 2025

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@tazarov tazarov requested review from HammadB and sanketkedia April 21, 2025 09:01
@jeffchuber
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@tazarov seems like possibly a bad bug... can you see what tests we have and why this was not caught?

@HammadB HammadB changed the title [BUG]: Wrong distance comparison in local HNSW [BUG]: <100 items, >20% delete Wrong distance comparison in local HNSW Apr 21, 2025
@HammadB HammadB merged commit bcabb26 into main Apr 21, 2025
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@Nayjest
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Nayjest commented Apr 21, 2025

@HammadB @tazarov, could you please let me know the planned release date that will include this fix?

Thanks!

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[Bug]: Deleted documents lead to incorrect results in 1.0.0 and later
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