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Add LIKE-based CJK (Chinese, Japanese, Korean) search support for PostgreSQL, gated behind a `CJKSearch` feature flag. PostgreSQL's built-in full-text search (`to_tsvector`/`to_tsquery`) does not support CJK languages because it relies on whitespace-based tokenization, which doesn't work for logographic/syllabic scripts that don't use spaces between words. This PR adds a `LIKE`-based fallback for search terms containing CJK characters. **How it works:** When the `CJKSearch` feature flag is enabled and a search term contains CJK characters (Han, Hiragana, Katakana, or Hangul), the query builder generates `LIKE '%term%'` clauses instead of `to_tsvector @@ to_tsquery` expressions. Case-sensitive `LIKE` is used rather than `ILIKE` since CJK scripts have no letter casing, which also allows potential use of standard B-tree indexes.
18 lines
378 B
Go
18 lines
378 B
Go
package model
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import (
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"unicode"
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)
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// ContainsCJK returns true if the string contains any CJK (Chinese, Japanese, Korean) characters.
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func ContainsCJK(s string) bool {
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for _, r := range s {
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if unicode.Is(unicode.Han, r) ||
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unicode.Is(unicode.Hiragana, r) ||
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unicode.Is(unicode.Katakana, r) ||
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unicode.Is(unicode.Hangul, r) {
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return true
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}
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}
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return false
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}
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