Initial implementation of manual ngram-based search in MongoDB #993
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| Committer | Matthew Evans |
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Codecov ReportAttention: Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## main #993 +/- ##
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+ Coverage 68.49% 68.92% +0.43%
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Files 62 62
Lines 3955 4026 +71
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+ Hits 2709 2775 +66
- Misses 1246 1251 +5
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I think this is ready for review now, though we should not make it the default (yet) until we can test scaling and quality of search results. |
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Closes #679 -- MongoDB text indexes tokenize using whitespace and punctuation only. This PR investigates whether we can build a manual ngram index, so when searching for refcode
ABCDEF, you get results if you only ask forABC,BCDetc.This is done by making a separate collection called
item_ftsthat is used only for this kind of search, by storingimmutable_id,typeandngramsfor all items, with an index overngrams. Lookup is then done by ngrammifying the query string and doing array lookup and ordering by the number of matches.Will have to fiddle around to see:
Nis, and whether we need to do all N+1-grams up to a fixed range