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amend the doc of fulltext-index
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amend the doc of fulltext index to make sure it can be used correctly.
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tongheihei authored Jul 22, 2021
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## 自然语言全文搜索

自然语言搜索将搜索的字符串解释为自然人类语言中的短语。搜索不区分大小写,且默认是对字符串的每一以空格分隔为单位的子字符串单独判断搜索。
自然语言搜索将搜索的字符串解释为自然人类语言中的短语。搜索不区分大小写,且默认是对字符串的每一以空格分隔为单位的子字符串单独判断搜索。例如,有三个点属于标签player,标签player含有属性name,这三个点的name分别为“Kevin Durant“,”Tim Duncan“,”David Beckham“,现在已经建立好有关player.name的全文索引,在用全文索引前缀搜索语句“LOOKUP ON player WHERE PREFIX(player.name,"d");”查询时,这三个点都会被查询到。

## 语法

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