[doc] add prefix index description #1459
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KassieZ
approved these changes
Dec 10, 2024
| @@ -51,7 +51,7 @@ Apache Doris 的数据存储在类似 SSTable（Sorted String Table）的数据 | |||
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| ## 使用语法 | |||
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| 前缀索引没有专门的语法去定义，建表时自动取表的 Key 的前 36 字节作为前缀索引。 | |||
| 前缀索引没有专门的语法去定义，建表时自动取表的 Key 的前 36 字节作为前缀索引。如果前缀索引碰见varchar类型的字段，会自动截断前20个字节。 | |||
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前缀索引没有专门的语法去定义，建表时自动取表的 Key 的前 36 字节作为前缀索引。如果前缀索引碰见 Varchar 类型的字段，会自动截断前 20 个字节。
- 请过大模型，碰见属于口语化表达。
- 中英文之间建议 英文首字母大写，中英文、中文与数字之间建议添加空格
以下是大模型优化后结果：
前缀索引无需专门语法定义，在创建表时，系统会自动将表的主键（Key）的前 36 个字节作为前缀索引。若前缀索引涉及 Varchar 类型的字段，则系统会自动截取该字段的前 20 个字节。
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