索引生成器被称为索引器。
Sphinx 有三个组件：索引生成器、搜索引擎和命令行 search 实用程序
Sphinx has three components: an index generator, a search engine, and a command-line search utility
用于在INSERT和UPDATE操作中构造索引键的键生成器函数。
Key generator function to construct index key during INSERT and UPDATE operations.
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