docs: add keepColumnName description

docs/en/14-reference/12-config/index.md

@@ -177,12 +177,21 @@ The parameters described in this document by the effect that they have on the sy
 ### maxNumOfDistinctRes
 
 | Attribute     | Description                                                                                                                                                                         |
-| -------- | -------------------------------- | --- |
+| -------- | -------------------------------- |
 | Applicable    | Server Only                                                                                                                                                                         |
 | Meaning       | The maximum number of distinct rows returned |
 | Value Range   | [100,000 - 100,000,000]                      |
 | Default Value | 100,000                                      |
 
+### keepColumnName
+
+| Attribute     | Description                             |
+| -------- | -------------------------------- |
+| Applicable | Client only                     |
+| Meaning     | When the Last, First, LastRow function is queried, whether the returned column name contains the function name. |
+| Value Range | 0 means including the function name, 1 means not including the function name.     |
+| Default Value   | 0                            |
+
 ## Locale Parameters
 
 ### timezone

docs/zh/14-reference/12-config/index.md

@@ -177,12 +177,21 @@ taos --dump-config
 ### maxNumOfDistinctRes
 
 | 属性     | 说明                             |
-| -------- | -------------------------------- | --- |
+| -------- | -------------------------------- |
 | 适用范围 | 仅服务端适用                     |
 | 含义     | 允许返回的 distinct 结果最大行数 |
 | 取值范围 | 默认值为 10 万，最大值 1 亿      |
 | 缺省值   | 10 万                            |
 
+### keepColumnName
+
+| 属性     | 说明                             |
+| -------- | -------------------------------- |
+| 适用范围 | 仅客户端适用                     |
+| 含义     | Last、First、LastRow 函数查询时，返回的列名是否包含函数名。 |
+| 取值范围 | 0 表示包含函数名，1 表示不包含函数名。      |
+| 缺省值   | 0                            |
+
 ## 区域相关
 
 ### timezone