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update TiFlash doc about expr pushdown when TiDB new collation is enabled #3687

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Merged
merged 6 commits into from
Jun 23, 2020
Merged

update TiFlash doc about expr pushdown when TiDB new collation is enabled #3687

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update TiFlash doc about expr pushdown when TiDB new collation is ena…
windtalker Jun 16, 2020
73cd7c5
Merge branch 'master' into collation_update
windtalker Jun 17, 2020
768c105
Update tiflash/use-tiflash.md
windtalker Jun 18, 2020
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Merge branch 'master' into collation_update
windtalker Jun 18, 2020
10e3459
Merge branch 'master' into collation_update
windtalker Jun 23, 2020
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Merge branch 'master' into collation_update
TomShawn Jun 23, 2020
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2 changes: 1 addition & 1 deletion tiflash/use-tiflash.md
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Expand Up @@ -218,7 +218,7 @@ TiSpark 目前提供类似 TiDB 中 engine 隔离的方式读取 TiFlash，方

> **注意：**
>
> 目前 TiFlash 支持 TiDB 新排序规则框架的功能正在开发中，所以在 TiDB 开启[新框架下的排序规则支持](/character-set-and-collation.md#新框架下的排序规则支持)后不支持任何表达式的下推，后续版本会去除这个限制。
> TiDB 4.0.2 版本之前，TiFlash 不支持支持 TiDB 新排序规则框架，所以在 TiDB 开启[新框架下的排序规则支持](/character-set-and-collation.md#新框架下的排序规则支持)后不支持任何表达式的下推，TiDB 4.0.2 以及后续的版本取消了这个限制。

TiFlash 主要支持谓词、聚合下推计算，下推的计算可以帮助 TiDB 进行分布式加速。暂不支持的计算类型主要是表连接和 DISTINCT COUNT，会在后续版本逐步优化。

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