Merge branch '3.0' of https://github.com/taosdata/TDengine into feat/tdlite

docs/en/05-get-started/01-docker.md

@@ -5,13 +5,25 @@ title: Quick Install on Docker
 
 This document describes how to install TDengine in a Docker container and perform queries and inserts.
 
-- The easiest way to explore TDengine is through [TDengine Cloud](http://cloud.tdengine.com). 
+- The easiest way to explore TDengine is through [TDengine Cloud](http://cloud.tdengine.com).
 - To get started with TDengine in a non-containerized environment, see [Quick Install from Package](../../get-started/package).
 - If you want to view the source code, build TDengine yourself, or contribute to the project, see the [TDengine GitHub repository](https://github.com/taosdata/TDengine).
 
 ## Run TDengine
 
-If Docker is already installed on your computer, run the following command:
+If Docker is already installed on your computer, pull the latest TDengine Docker container image:
+
+```shell
+docker pull tdengine/tdengine:latest
+```
+
+Or the container image of specific version:
+
+```shell
+docker pull tdengine/tdengine:3.0.1.4
+```
+
+And then run the following command:
 
 ```shell
 docker run -d -p 6030:6030 -p 6041:6041 -p 6043-6049:6043-6049 -p 6043-6049:6043-6049/udp tdengine/tdengine

docs/en/12-taos-sql/10-function.md

@@ -864,7 +864,7 @@ INTERP(expr)
 - `INTERP` is used to get the value that matches the specified time slice from a column. If no such value exists an interpolation value will be returned based on `FILL` parameter.
 - The input data of `INTERP` is the value of the specified column and a `where` clause can be used to filter the original data. If no `where` condition is specified then all original data is the input.
 - The output time range of `INTERP` is specified by `RANGE(timestamp1,timestamp2)` parameter, with timestamp1<=timestamp2. timestamp1 is the starting point of the output time range and must be specified. timestamp2 is the ending point of the output time range and must be specified.
-- The number of rows in the result set of `INTERP` is determined by the parameter `EVERY`. Starting from timestamp1, one interpolation is performed for every time interval specified `EVERY` parameter.
+- The number of rows in the result set of `INTERP` is determined by the parameter `EVERY`. Starting from timestamp1, one interpolation is performed for every time interval specified `EVERY` parameter. The parameter `EVERY` must be an integer, with no quotes, with a time unit of: b(nanosecond), u(microsecond), a(millisecond)), s(second), m(minute), h(hour), d(day), or w(week). For example, `EVERY(500a)` will interpolate every 500 milliseconds.
 - Interpolation is performed based on `FILL` parameter.
 - `INTERP` can only be used to interpolate in single timeline. So it must be used with `partition by tbname` when it's used on a STable.
 - Pseudo column `_irowts` can be used along with `INTERP` to return the timestamps associated with interpolation points(support after version 3.0.1.4).

docs/zh/05-get-started/01-docker.md

@@ -8,7 +8,19 @@ description: 使用 Docker 快速体验 TDengine 的高效写入和查询
 
 ## 启动 TDengine
 
-如果已经安装了 Docker，只需执行下面的命令：
+如果已经安装了 Docker，首先拉取最新的 TDengine 容器镜像：
+
+```shell
+docker pull tdengine/tdengine:latest
+```
+
+或者指定版本的容器镜像：
+
+```shell
+docker pull tdengine/tdengine:3.0.1.4
+```
+
+然后只需执行下面的命令：
 
 ```shell
 docker run -d -p 6030:6030 -p 6041:6041 -p 6043-6049:6043-6049 -p 6043-6049:6043-6049/udp tdengine/tdengine