Merge pull request #18989 from taosdata/feature/stream

docs(stream)

docs/en/12-taos-sql/14-stream.md

@@ -75,6 +75,21 @@ Normally a stream does not process data already or being written into source tab
 create stream if not exists s1 fill_history 1 into st1  as select count(*) from t1 interval(10s)
 ```
 
+Combining fill_history option and where clause, stream can processing data of specific time range. For example, only process data after a past time. (In this case, 2020-01-30)
+
+```sql
+create stream if not exists s1 fill_history 1 into st1  as select count(*) from t1 where ts > timestamp '2020-01-30' interval(10s)
+```
+
+As another example, only processing data starting from some past time, and ending at some future time.
+
+```sql
+create stream if not exists s1 fill_history 1 into st1  as select count(*) from t1 where ts > timestamp '2020-01-30' and ts < timestamp '2023-01-01 '> interval(10s)
+```
+
+If some streams are totally outdated, and you do not want it to monitor or process anymore, those streams can be manually dropped and output data will be still kept.
+
+
 ## Delete a Stream
 
 ```sql

docs/zh/12-taos-sql/14-stream.md

@@ -76,6 +76,20 @@ PARTITION 子句中，为 tbname 定义了一个别名 tname, 在PARTITION 子
 create stream if not exists s1 fill_history 1 into st1  as select count(*) from t1 interval(10s)
 ```
 
+结合 fill_history 1 选项，可以实现只处理特定历史时间范围的数据，例如：只处理某历史时刻（2020年1月30日）之后的数据
+
+```sql
+create stream if not exists s1 fill_history 1 into st1  as select count(*) from t1 where ts > timestamp '2020-01-30' interval(10s)
+```
+
+再如，仅处理某时间段内的数据，结束时间可以是未来时间
+
+```sql
+create stream if not exists s1 fill_history 1 into st1  as select count(*) from t1 where ts > timestamp '2020-01-30' and ts < timestamp '2023-01-01 '> interval(10s)
+```
+
+如果该流任务已经彻底过期，并且您不再想让它检测或处理数据，您可以手动删除它，被计算出的数据仍会被保留。
+
 ## 删除流式计算
 
 ```sql