sql: add doc for tidb executor #859
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shenli
reviewed
Aug 29, 2018
| @@ -18,9 +18,10 @@ | |||
| - [TiDB 访问权限管理](sql/privilege.md) | |||
| - [TiDB 用户账户管理](sql/user-account-management.md) | |||
| - [使用加密连接](sql/encrypted-connections.md) | |||
| + SQL 优化 | |||
| + SQL 优化与执行 | |||
zz-jason
reviewed
Aug 30, 2018
| | [1] (2, 3) | 2 | | ||
| | [2] (1, 3) | 1 | | ||
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| TiDB 中，为了加快执行速度，Hash Aggregate 在聚合函数参数不为 distinct 时并行执行。 |
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前面那个简单版本的一句话就可以讲完，后面这个并行执行的模式可以深入讲讲。。
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比如可以介绍一下那几种聚合的状态，不同状态的输入输出是什么，状态间如何交互的等等
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Paused. I'll reopen this later. |
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This PR does 2 things: