[9.0] Knn vector rescoring to sort score docs (#122653) #122674
Merged
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
RescoreKnnVectorQuery rewrites to KnnScoreDocQuery, which takes a sorted array of doc ids and corresponding array including scores fo such docs. A binary search is performed on top of the docs array, and such global ids are converted back to segment level ids (subtracting the context docbase) when scoring docs. RescoreKnnVectoryQuery did not sort the array of docs which caused binary search to return non deterministic results, which in turn made us look up wrong docs, something using out of bound ids. One symptom of this was observed in a DFSProfilerIT test failure which triggered a Lucene assertion around doc id being outside of the range of the bitset of live docs. The fix is to simply sort the score docs array before extracting docs ids and scores and providing them to KnnScoreDocQuery upon rewrite. Relates to elastic#116663 Closes elastic#119711
javanna
added
:Search Relevance/Vectors
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Backports the following commits to 9.0: