feat(fts): add stemmer token filter based on Snowball 3.1.1#513
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feat(fts): add stemmer token filter based on Snowball 3.1.1#513egolearner wants to merge 5 commits into
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把这部分注释去掉了，作为内部接口不太需要，也避免和实现的不一致
Implement a stemmer token filter for FTS that reduces words to their root form using the Snowball stemming library. Supports 34+ languages configurable via stemmer_lang in extra_params (defaults to english). Changes: - Integrate Snowball 3.1.1 as a thirdparty static library - Add StemmerTokenFilter with thread_local stemmer cache (lock-free) - Register 'stemmer' filter in TokenizerFactory - Add unit tests and FtsColumnIndexer end-to-end tests
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Implement a stemmer token filter for FTS that reduces words to their root form using the Snowball stemming library. Supports 34+ languages configurable via stemmer_lang in extra_params (defaults to english).
Changes: