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Update release-5.2.0.md
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qiancai committed Aug 28, 2021
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Expand Up @@ -66,9 +66,9 @@ TiDB 版本:5.2.0

### SQL

- **新增表达式索引 (Expression index)**
- **支持基于部分函数创建表达式索引 (Expression index)**

表达式索引是一种特殊的索引,能将索引建立于表达式上。创建了表达式索引后,TiDB 支持部分函数基于表达式的查询,极大提升查询的性能。
表达式索引是一种特殊的索引,能将索引建立于表达式上。创建了表达式索引后,TiDB 支持基于表达式的查询,极大提升查询的性能。

[用户文档](/sql-statements/sql-statement-create-index.md)[#25150](https://github.com/pingcap/tidb/issues/25150)

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