Optimized some descriptions in the documents.

This commit is contained in:
fhxing168 2020-07-21 11:38:52 +08:00
parent e8a3d0f239
commit 13aa4e32c5
24 changed files with 28 additions and 30 deletions

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@ -472,7 +472,7 @@ Heuristic index is external index module that which can be used to filter to out
| `hetu.filter.indexstore.hdfs.krb5.keytab.path` | YES if auth type set to KERBEROS | Path to the kerberos keytab file |
| `hetu.filter.indexstore.hdfs.krb5.principal` | YES if auth type set to KERBEROS | Principal of kerberos authentication |
##Execution Plan Cache Properties
## Execution Plan Cache Properties
Execution plan cache feature allows the coordinator to reuse execution plans between identical queries, instead
of constructing another execution plan, thus reducing the amount of query pre-processing required.

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@ -11,7 +11,7 @@ A utility class ``FileBasedLock`` located in SPI can provide exclusive access on
The filesystem clients are implemented as openLooKeng Plugins. The implementations are placed in the ``hetu-filesystem-client`` module, where one factory extending ``HetuFileSystemClientFactory`` must be implemented and registered in ``HetuFileSystemClientPlugin``.
## Filesystem Profiles
A filesystem profile must contain a type field::
A filesystem profile must contain a type field:
fs.client.type=<filesystem type>

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@ -229,7 +229,7 @@ or:
bash /opt/openlookeng/bin/add_cluster_node.sh --file <add_nodes_file_path>
```
If there are multiple nodes,separated by commas(,).
If there are multiple nodes, separated by commas(,).
## Removing Node to Cluster

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@ -38,5 +38,4 @@ Only Hive connector support this functionality at this time. See connector docum
See Also
--------
[SHOW CACHE](./show-cache.md)
[DROP CACHE](./drop-cache.md)
[SHOW CACHE](./show-cache.md), [DROP CACHE](./drop-cache.md)

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@ -25,5 +25,4 @@ COMMIT WORK;
See Also
--------
[ROLLBACK](./rollback.md)
[START TRANSACTION](./start-transaction.md)
[ROLLBACK](./rollback.md), [START TRANSACTION](./start-transaction.md)

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@ -36,4 +36,4 @@ Some connectors do not support role management. See connector documentation for
See Also
--------
[DROP ROLE](./drop-role.md), [SET ROLE](./set-role.md), [GRANT ROLES](./grant-roles.md),[REVOKE ROLES](./revoke-roles.md)
[DROP ROLE](./drop-role.md), [SET ROLE](./set-role.md), [GRANT ROLES](./grant-roles.md), [REVOKE ROLES](./revoke-roles.md)

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@ -40,4 +40,4 @@ Create the schema `traffic` if it does not already exist:
See Also
--------
[ALTER SCHEMA](./alter-schema.md) ,[DROP SCHEMA](./drop-schema.md)
[ALTER SCHEMA](./alter-schema.md), [DROP SCHEMA](./drop-schema.md)

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@ -18,7 +18,7 @@ or by reaching size limit but recurring splits will not reuse any cached node as
Examples
--------
Drop cache metadata for `sales' table
Drop cache metadata for 'sales' table
```sql
DROP CACHE sales

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@ -42,4 +42,4 @@ Some connectors do not support role management. See connector documentation for
See Also
--------
[CREATE ROLE](./create-role.md), [DROP ROLE](./drop-role).md, [SET ROLE](./set-role.md), [REVOKE ROLES](./revoke-roles.md)
[CREATE ROLE](./create-role.md), [DROP ROLE](./drop-role.md), [SET ROLE](./set-role.md), [REVOKE ROLES](./revoke-roles.md)

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@ -59,4 +59,4 @@ Right now only Hive Connector support insert overwrite.
See Also
--------
[VALUES](./values), [INSERT](./insert.md)
[VALUES](./values.md), [INSERT](./insert.md)

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@ -86,7 +86,7 @@ Additionally, the relations within a `WITH` clause can chain:
**Warning**
*Currently, the SQL for the `WITH` clause will be inlined anywhere the* *named relation is used. This means that if the relation is used more* *than once and the query is non-deterministic, the results may be* *different each time.*
*Currently, the SQL for the `WITH` clause will be inlined anywhere the named relation is used. This means that if the relation is used more than once and the query is non-deterministic, the results may be different each time.*
SELECT Clause
-------------

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@ -21,7 +21,7 @@ The command requires the current catalog to be set.
**Note**
*Ensure that authentication has been enabled before running any of the* *authorization commands.*
*Ensure that authentication has been enabled before running any of the authorization commands.*
Examples
--------

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@ -14,4 +14,4 @@ Description
`SHOW ROLES` lists all the roles in `catalog` or in the current catalog if `catalog` is not specified.
`SHOW CURRENT ROLES` lists the enabled roles for the session in `catalog, or in the current catalog if`catalog\`\` is not specified.
`SHOW CURRENT ROLES` lists the enabled roles for the session in `catalog`, or in the current catalog if `catalog` is not specified.

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@ -11,7 +11,7 @@ SPI 中的实用程序类 `FileBasedLock` 可以提供对给定的文件系统
## 文件系统配置文件
文件系统配置文件必须包含一个类型字段::
文件系统配置文件必须包含一个类型字段
fs.client.type=<filesystem type>

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@ -17,7 +17,7 @@ openLooKeng需要一个*数据*目录来存储日志等。我们建议在安装
- 节点属性:每个节点特有的环境配置。
- JVM配置Java虚拟机的命令行选项。
- 配置属性openLooKeng服务器的配置。
- 目录属性:[连接器](../connector/_index)(数据源)配置。
- 目录属性:[连接器](../connector/_index.md)(数据源)配置。
### 节点属性

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@ -7,7 +7,7 @@
**注意**
*新的`TIMESTAMP`语义仍在试验中。建议* 保持原有`TIMESTAMP`语义为启用状态。您可以通过全局配置或基于每个会话配置新的语义来验证新语义**。在新版本中,可能会废弃旧版的语义。
*新的`TIMESTAMP`语义仍在试验中。建议保持原有`TIMESTAMP`语义为启用状态。您可以通过全局配置或基于每个会话配置新的语义来验证新语义。在新版本中,可能会废弃旧版的语义。*
配置

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@ -179,6 +179,7 @@ openLooKeng有一组内置的数据类型如下所述。可能通过插件提
> 例如: `ARRAY[1, 2, 3]`
### `MAP`
> 指定组件类型之间的映射。
>
> 例如: `MAP(ARRAY['foo', 'bar'], ARRAY[1, 2])`

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@ -103,7 +103,7 @@ WHERE x = 'foo'
## 使用UNNEST来扩展数组和映射
openLooKeng支持`unnest`{.interpreted-text role="ref"}用于扩展数组和映射。使用`UNNEST`代替`LATERAL VIEW explode()`。
openLooKeng支持`unnest`用于扩展数组和映射。使用`UNNEST`代替`LATERAL VIEW explode()`。
Hive查询

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@ -126,7 +126,7 @@ INSERT INTO table1
| 参数名称| 描述|
|----------|----------|
| `file`| 包含SQL语句的文件以“;”分隔。 文件中的所有SQL都可以进行批量转换。|
| `file`| 包含SQL语句的文件以“;”分隔。文件中的所有SQL都可以进行批量转换。|
| `sourceType`| 输入SQL语句的类型如`hive`、`impala`。可选参数,默认值为`hive`。|
| `output`| 转换后SQL结果的存放目录。|
| `config`| SQL迁移工具的配置文件。|

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@ -33,5 +33,4 @@ CACHE TABLE table_name WHERE condition
## 另请参见
[SHOW CACHE](./show-cache.md)
[DROP CACHE](./drop-cache.md)
[SHOW CACHE](./show-cache.md)、[DROP CACHE](./drop-cache.md)

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@ -11,7 +11,7 @@ CALL procedure_name ( [ name => ] expression [, ...] )
调用过程。
过程可以由连接器提供,以执行数据操作或管理任务。例如,`/connector/system`{.interpreted-text role="doc"} 定义了用于终止正在运行的查询的过程。
过程可以由连接器提供,以执行数据操作或管理任务。例如,`/connector/system`定义了用于终止正在运行的查询的过程。
某些连接器(如 [PostgreSQL连接器](../connector/postgresql.md))用于具有其自己的存储过程的系统。这些存储过程与此处讨论的连接器定义过程相分离,因此无法通过 `CALL` 直接调用。

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@ -18,23 +18,23 @@ where option can be one of:
`SINGLE`
片段在单个节点上执行。
片段在单个节点上执行。
`HASH`
片段在固定数量的节点上执行,输入数据通过哈希函数进行分布。
片段在固定数量的节点上执行,输入数据通过哈希函数进行分布。
`ROUND_ROBIN`
片段在固定数量的节点上执行,输入数据以轮循方式进行分布。
片段在固定数量的节点上执行,输入数据以轮循方式进行分布。
`BROADCAST`
片段在固定数量的节点上执行,输入数据广播到所有节点。
片段在固定数量的节点上执行,输入数据广播到所有节点。
`SOURCE`
片段在访问输入分段的节点上执行。
片段在访问输入分段的节点上执行。
## 示例

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@ -81,7 +81,7 @@ ROLLUP ( column [, ...] )
**警告**
*目前,`WITH`子句的SQL将在使用命名关系的任何位置内联。****这意味着,如果关系被多次使用,并且查询是非确定性的,那么每次的结果都可能不同。*
*目前,`WITH`子句的SQL将在使用命名关系的任何位置内联。这意味着如果关系被多次使用并且查询是非确定性的那么每次的结果都可能不同。*
## SELECT子句

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@ -17,7 +17,7 @@ SHOW GRANTS [ ON [ TABLE ] table_name ]
**注意**
在执行任何授权命令之前,确保已启用身份验证。
*在执行任何授权命令之前,确保已启用身份验证。*
## 示例