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seen from Libya
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SQLite 的全文搜尋功能
算是補充之前看過,但一直沒研究的東西…
看到 Simon Willison 的「Exploring search relevance algorithms with SQLite」這篇才花些時間看了一下 SQLite 的搜尋功能。
看起來不論是 FTS4 或是 FTS5 都沒有處理 CJK 文字的功能,可能要當作 unigram 之類的方式處理 (參考「Unicode support for non-English characters with Sqlite Full Text Search in Android」這篇),不過排名的部份有支援 BM25,整體看起來應該是還算堪用。
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