docs: add incremental doc

docs/en_US/guide/rules/overview.md

@@ -175,6 +175,8 @@ See the table below for a detailed explanation of each rule behavior:
 | cronDatetimeRange  | lists of struct      | Specify the effective time period of the Scheduled Rule, which is only valid when `cron` is specified. When this `cronDatetimeRange` is specified, the Scheduled Rule will only take effect within the time range specified. Please see [Scheduled Rule](#Scheduled Rule) for detailed configuration items                                        |
 | enableRuleTracer   | bool: false          | Specify whether the rule enables rule-level data tracing                                                                                                                                                                                                                                                                                          |
 
+| planOptimizeStrategy | struct | Specify whether the rule turns on the corresponding optimization |
+
 For detail about `qos` and `checkpointInterval`, please check [state and fault tolerance](./state_and_fault_tolerance.md).
 
 The rule options can be defined globally in `etc/kuiper.yaml` under the `rules` section. The options defined in the rule json will override the global setting.
@@ -231,6 +233,16 @@ When a periodic rule is stopped by [stop rule](../../api/restapi/rules.md#stop-a
 
 When `cronDatetimeRange` is configured but `cron` and `duration` are empty, the rule will run according to the time period specified by `cronDatetimeRange` until the time period is exceeded.
 
+### Rule optimization switch
+
+The rule optimization switch `planOptimizeStrategy` can control whether the rule enables specific rule optimization:
+
+The configuration items of `planOptimizeStrategy` are as follows:
+
+| option name | type and default value | description |
+|-------|--------|-------------------------------- ----------|
+| enableIncrementalWindow | bool: false | Enable incremental calculation when the rule contains both a time window and an aggregate function that supports incremental calculation |
+
 ## View Rule Status
 
 When a rule is deployed to eKuiper, we can use the rule indicator to understand the current running status of the rule.

docs/zh_CN/guide/rules/overview.md

@@ -154,6 +154,7 @@ eKuiper 已经内置了丰富的 sink connector 类型，如 mqtt、rest 和 fil
 | duration           | string: ""  | 指定规则的运行持续时间，只有当指定了 cron 后才有效。duration 不应该超过两次 cron 周期之间的时间间隔，否则会引起非预期的行为。                      |
 | cronDatetimeRange  | 结构体数组       | 指定周期性规则的生效时间段。当指定了该参数后，周期性规则只有在这个参数所制定的时间范围内才生效。请查看 [周期性规则](#周期性规则) 了解详细的配置项目                  |
 | enableRuleTracer   | bool: false | 指定规则是否开启规则级别的数据追踪                                                                              |
+| planOptimizeStrategy | 结构体     | 指定规则是否打开对应优化                                                                                      |
 
 有关 `qos` 和 `checkpointInterval` 的详细信息，请查看[状态和容错](./state_and_fault_tolerance.md)。
 
@@ -207,6 +208,16 @@ cronDatetimeRange 支持结构体数组，你可以声明一组时间段来表
 }
 ```
 
+### 规则优化开关
+
+在规则优化开关 `planOptimizeStrategy` 可以控制该规则是否启用特定的规则优化:
+
+`planOptimizeStrategy` 的配置项如下:
+
+| 选项名   | 类型和默认值 | 说明                                        |
+|-------|--------|-------------------------------------------|
+| enableIncrementalWindow | bool: false | 当规则同时包含时间窗口和支持增量计算的聚合函数时，启用增量计算 |
+
 #### 阶段运行规则
 
 当 `cronDatetimeRange` 配置了但是 `cron` 与 `duration` 为空时，则该规则会按照 `cronDatetimeRange` 所指定的时间阶段内一直运行，直到超出该时间阶段。