Direct intersections with serialized RoaringBitmaps #281
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irevoire
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Jun 7, 2024
Co-authored-by: Tamo <[email protected]>
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4682: Speed Up Filter ANDs operations r=Kerollmops a=Kerollmops This PR fixes #4659 and improves the way we do AND operations by using the latest [RoaringBitmap feature to do intersections with serialized bitmaps](RoaringBitmap/roaring-rs#281). Doing so drastically reduces the time spent reading, copying bytes in memory to use and keep a subset of the containers in the bitmap. ### Some Example Results With a 45M documents dataset running on a good NVMe. This example filter was taking 77ms and with this PR only 13ms (6x speedup): ```sql artist = 'The Beatles' AND (duration 150 TO 500 OR duration NOT EXISTS) AND genres IN [Rock, 'Rock and Roll'] AND rating > 4 AND released_year 1960 TO 1990 ``` By reordering the filter AND clauses we can reach a constant 8ms execution time. However, note that it is a manual operation. On the other side the previous filter pipeline is still at a constant 45ms execution time with this filter. (6x speedup) ```sql artist = 'The Beatles' AND genres IN [Rock, 'Rock and Roll'] AND released_year 1960 TO 1990 AND (duration 150 TO 500 OR duration NOT EXISTS) ``` ### To Do - [x] Rebase on `release-v1.9.0`. - [ ] ~Skip branches of the facet/filter tree when nothing is in common with the universe~ slower this way. - [x] When the universe is required use the universe given in parameter if possible. Co-authored-by: Clément Renault <[email protected]>
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This PR is related to #263 and implements methods to do intersections directly with serialized data. This avoids deserializing everything in memory to reduce it just after which drastically reduces the amount of allocated memory and intensive intersection operations.
To Do
Convert operation methods to use the(too much work for now, let's ship)BitAndAssign/BitAndtraits