> ## Documentation Index
> Fetch the complete documentation index at: https://private-7c7dfe99-home-button.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

> 可从 YTsaurus 集群导入数据的表引擎。

# YTsaurus 表引擎

export const ExperimentalBadge = () => {
  return <div className="experimentalBadge">
            <div className="experimentalIcon">
            <svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
                <path strokeWidth="1.25" d="M5.5 2H10.5" stroke="currentColor" strokeLinecap="round" strokeLinejoin="round" />
                <path strokeWidth="1.25" d="M9.50015 2V6.19625L13.4283 12.7425C13.4738 12.8183 13.4985 12.9049 13.4996 12.9934C13.5008 13.0818 13.4785 13.169 13.435 13.246C13.3914 13.323 13.3283 13.3871 13.2519 13.4317C13.1755 13.4764 13.0886 13.4999 13.0002 13.5H3.00015C2.91164 13.5 2.8247 13.4766 2.74822 13.432C2.67174 13.3874 2.60847 13.3233 2.56487 13.2463C2.52126 13.1693 2.49889 13.082 2.50004 12.9935C2.50119 12.905 2.52582 12.8184 2.5714 12.7425L6.50015 6.19625V2" stroke="currentColor" strokeLinecap="round" strokeLinejoin="round" />
                <path strokeWidth="1.25" d="M4.47656 9.56754C5.30344 9.41254 6.47656 9.47942 7.99969 10.25C10.0153 11.2707 11.4216 11.0569 12.2184 10.7282" stroke="currentColor" strokeLinecap="round" strokeLinejoin="round" />
            </svg>
        </div>
            Experimental feature. <u><a href="/docs/beta-and-experimental-features#experimental-features">Learn more.</a></u>
        </div>;
};

export const CloudNotSupportedBadge = () => {
  return <div className="cloudNotSupportedBadge">
            <div className="cloudNotSupportedIcon">
            <svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
                <path strokeWidth="1.5" d="M6.33366 12.6666L12.3739 12.6667C13.6593 12.6667 14.7073 11.6187 14.7073 10.3334C14.7073 9.04804 13.6593 8.00003 12.3739 8.00003C12.3739 8.00003 12.3337 7.66659 12.0003 7.33325M10.667 5.33322C8.00033 2.33325 4.45395 4.78537 4.14195 6.68203C2.55728 6.7627 1.29395 8.06203 1.29395 9.6667C1.29395 11.3234 2.66699 12.6666 4.00033 12.6666" stroke="currentColor" strokeLinecap="round" strokeLinejoin="round" />
                <path strokeWidth="1.5" d="M2.66699 14L12.0003 4.66663" stroke="currentColor" strokeLinecap="round" strokeLinejoin="round" />
            </svg>

        </div>
            Not supported in ClickHouse Cloud
        </div>;
};

YTsaurus 表引擎可让您从 YTsaurus 集群导入数据。

<div id="creating-a-table">
  ## 创建表
</div>

```sql theme={null}
    CREATE TABLE [IF NOT EXISTS] [db.]table_name
    (
        name1 [type1],
        name2 [type2], ...
    ) ENGINE = YTsaurus('http_proxy_url', 'cypress_path', 'oauth_token')
```

<Info>
  这是一项 Experimental 功能，未来的发行版中可能会发生不向后兼容的变更。
  使用设置 [`allow_experimental_ytsaurus_table_engine`](/zh/reference/settings/session-settings#allow_experimental_ytsaurus_table_engine)
  启用 YTsaurus 表引擎。

  你可以使用以下命令：

  `SET allow_experimental_ytsaurus_table_engine = 1`.
</Info>

**引擎参数**

* `http_proxy_url` — YTsaurus HTTP 代理的 URL。
* `cypress_path` — 数据源的 Cypress 路径。
* `oauth_token` — OAuth 令牌。

<div id="usage-example">
  ## 用法示例
</div>

演示创建 YTsaurus 表的查询：

```sql title="Query" theme={null}
SHOW CREATE TABLE yt_saurus;
```

```sql title="Response" theme={null}
CREATE TABLE yt_saurus
(
    `a` UInt32,
    `b` String
)
ENGINE = YTsaurus('http://localhost:8000', '//tmp/table', 'password')
```

要查询表中的数据，请运行：

```sql title="Query" theme={null}
SELECT * FROM yt_saurus;
```

```response title="Response" theme={null}
 ┌──a─┬─b──┐
 │ 10 │ 20 │
 └────┴────┘
```

<div id="data-types">
  ## 数据类型
</div>

<div id="primitive-data-types">
  ### 基本数据类型
</div>

| YTsaurus 数据类型               | ClickHouse 数据类型 |
| --------------------------- | --------------- |
| `int8`                      | `Int8`          |
| `int16`                     | `Int16`         |
| `int32`                     | `Int32`         |
| `int64`                     | `Int64`         |
| `uint8`                     | `UInt8`         |
| `uint16`                    | `UInt16`        |
| `uint32`                    | `UInt32`        |
| `uint64`                    | `UInt64`        |
| `float`                     | `Float32`       |
| `double`                    | `Float64`       |
| `boolean`                   | `Bool`          |
| `string`                    | `String`        |
| `utf8`                      | `String`        |
| `json`                      | `JSON`          |
| `yson(type_v3)`             | `JSON`          |
| `uuid`                      | `UUID`          |
| `date32`                    | `Date` (尚不支持)   |
| `datetime64`                | `Int64`         |
| `timestamp64`               | `Int64`         |
| `interval64`                | `Int64`         |
| `date`                      | `Date` (尚不支持)   |
| `datetime`                  | `DateTime`      |
| `timestamp`                 | `DateTime64(6)` |
| `interval`                  | `UInt64`        |
| `any`                       | `String`        |
| `null`                      | `Nothing`       |
| `void`                      | `Nothing`       |
| `T` with `required = False` | `Nullable(T)`   |

<div id="composite-data-types">
  ### 复合类型
</div>

| YTsaurus 数据类型 | ClickHouse 数据类型     |
| ------------- | ------------------- |
| `decimal`     | `Decimal`           |
| `optional`    | `Nullable`          |
| `list`        | `Array`             |
| `struct`      | `NamedTuple`        |
| `tuple`       | `Tuple`             |
| `variant`     | `Variant`           |
| `dict`        | \`Array(Tuple(...)) |
| `tagged`      | `T`                 |

**另请参阅**

* [ytsaurus](/zh/reference/functions/table-functions/ytsaurus) 表函数
* [ytsaurus data schema](https://ytsaurus.tech/docs/en/user-guide/storage/static-schema)
* [ytsaurus 数据类型](https://ytsaurus.tech/docs/en/user-guide/storage/data-types)