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Fix a note display error (#4699) (#4701)
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* cherry pick #4699 to release-4.0

Signed-off-by: ti-srebot <ti-srebot@pingcap.com>

* trigger

* trigger

Co-authored-by: TomShawn <41534398+TomShawn@users.noreply.github.com>
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ti-srebot and TomShawn authored Oct 16, 2020
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Showing 1 changed file with 2 additions and 2 deletions.
4 changes: 2 additions & 2 deletions choose-index.md
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Expand Up @@ -23,8 +23,8 @@ aliases: ['/docs-cn/stable/choose-index/','/docs-cn/v4.0/choose-index/']
| IndexReader | 表有一个或多个索引,且计算所需的列被包含在索引里 | 存在较小的索引上的范围查询,或者对索引列有顺序需求的时候 | 当存在多个索引的时候,会根据估算代价选择合理的索引 |
| IndexLookupReader | 表有一个或多个索引,且计算所需的列**不完全**被包含在索引里 | 同 IndexReader | 因为计算列不完全被包含在索引里,所以读完索引后需要回表,这里会比 IndexReader 多一些开销 |

> 注意:
>
> **注意:**
>
> TableReader 是基于 `_tidb_rowid` 的索引,TiFlash 是列存索引,所以索引的选择即是读表算子的选择。
## 索引的选择
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